{"id":25392,"date":"2024-04-19T07:57:19","date_gmt":"2024-04-19T15:57:19","guid":{"rendered":"https:\/\/chansmachining.com\/rezistenta-la-intindere-vs-rezistenta-la-tractiune-intelegerea-diferentelor-cheie\/"},"modified":"2024-12-26T18:51:27","modified_gmt":"2024-12-27T02:51:27","slug":"rezistenta-la-intindere-vs-rezistenta-la-tractiune-intelegerea-diferentelor-cheie","status":"publish","type":"post","link":"https:\/\/chansmachining.com\/ro\/rezistenta-la-intindere-vs-rezistenta-la-tractiune-intelegerea-diferentelor-cheie\/","title":{"rendered":"Rezisten\u021ba la \u00eentindere VS rezisten\u021ba la trac\u021biune: \u00cen\u021belegerea diferen\u021belor cheie"},"content":{"rendered":"\n

Ce este rezisten\u021ba la \u00eentindere?<\/h2>\n\n
\"Calculator
Calculator \u0219i formul\u0103 de rezisten\u021b\u0103 la rupere<\/figcaption><\/figure>\n\n

Rezisten\u021ba la \u00eentindere<\/mark><\/a>, reprezentat\u0103 prin \u03c3 y<\/strong>, este cea mai mare tensiune pe care un material o poate suporta \u00eenainte de deformare permanent\u0103. Aceast\u0103 proprietate m\u0103soar\u0103 ductilitatea unui material. Cu toate acestea, f\u0103r\u0103 a atinge acest punct, materialul va reveni \u00eentotdeauna la forma sa ini\u021bial\u0103 dup\u0103 \u00eendep\u0103rtarea tensiunii.<\/p>\n\n

Rezisten\u021ba la rupere este demonstrat\u0103 prin \u00eendoirea unei rigle din plastic. Ini\u021bial, rigla \u00ee\u0219i recap\u0103t\u0103 planeitatea. Cu toate acestea, \u00eendoirea excesiv\u0103 dep\u0103\u0219e\u0219te limita de curgere, ceea ce duce fie la \u00eendoire permanent\u0103, fie la rupere. Cu alte cuvinte, tensiunea de rezisten\u021b\u0103 implic\u0103 un nivel de tensiune la care \u00eencepe o schimbare ireversibil\u0103, ca \u00een cazul alungirii de 0,2%.<\/p>\n\n

\u00cen cazul \u00een care sunte\u021bi interesat de flexibilitate pentru proiecte precum podurile suspendate care se ajusteaz\u0103 \u00een func\u021bie de greutate \u0219i v\u00e2nt, atunci este esen\u021bial s\u0103 lua\u021bi \u00een considerare rezisten\u021ba la curgere. Orice deformare de la acest punct de curgere indic\u0103 faptul c\u0103 a avut loc o defec\u021biune, \u00een timp ce altele, cum ar fi revenirea la forma „U”, sunt destul de benefice deoarece fac paranteze. De aici \u00eencolo este vorba despre rezisten\u021ba la trac\u021biune.<\/p>\n\n

Materialele ajung la cedare \u00een timpul solicit\u0103rii, c\u00e2nd se produce o deformare de la recuperabil\u0103 la permanent\u0103. Rezisten\u021ba la curgere m\u0103surat\u0103 adesea \u00een N\/m\u00b2 sau pascali (unitatea de rezisten\u021b\u0103 la curgere) arat\u0103 c\u0103, peste un anumit nivel de solicitare, modific\u0103rile nu mai pot fi inversate \u0219i au devenit ireversibile; prin urmare, indic\u0103 locul unde a \u00eenceput ruptura pe diagrama sarcinii \u00een func\u021bie de extensie la o abatere de la propor\u021bionalitate.<\/p>\n\n

Aceasta este cunoscut\u0103 sub denumirea de limit\u0103 de curgere, determinat\u0103 prin testul de trac\u021biune utiliz\u00e2nd calculul tensiunii de curgere. Pe curbele testului de rezisten\u021b\u0103, materiale precum anumite materiale plastice prezint\u0103 o cedare treptat\u0103, ceea ce face ca tensiunea de rezisten\u021b\u0103 s\u0103 fie o alt\u0103 m\u0103sur\u0103 util\u0103 a comportamentului lor. Tensiunea de \u00eencercare\/tensiunea de offset indic\u0103 cantitatea de tensiune aplicat\u0103 necesar\u0103 doar pentru o defroma\u021bie permanent\u0103 minim\u0103 stabilit\u0103 la o deforma\u021bie de 0,2% standardizat\u0103 \u00een ceea ce prive\u0219te considera\u021biile pentru formula rezisten\u021bei la curgere.<\/p>\n\n

Atunci c\u00e2nd unele substan\u021be, cum ar fi metalele, sunt u\u0219or \u00eentinse, acestea \u00ee\u0219i recap\u0103t\u0103 propriet\u0103\u021bile ini\u021biale, denumite elasticitate, dar atunci c\u00e2nd sunt trase pu\u021bin dincolo de aceast\u0103 limit\u0103, ele sufer\u0103 o alungire sau o deformare permanent\u0103, denumit\u0103 \u00een mod obi\u0219nuit efect de plasticitate.”Are loc \u00een timpul protocoalelor de testare \u0219i reprezint\u0103 acele calcule esen\u021biale \u00een determinarea a ceea ce constituie limita de elasticitate.” Cuv\u00e2ntul „permanent” este utilizat pentru a se referi la modific\u0103rile permanente care nu includ niciunul dintre comportamentele elastice.<\/p>\n\n

Ce este rezisten\u021ba la trac\u021biune?<\/h2>\n\n
\"Diagrama
Diagrama tensiune-deformare la trac\u021biune<\/figcaption><\/figure>\n\n

Rezisten\u021ba la trac\u021biune, denumit\u0103 \u0219i rezisten\u021b\u0103 maxim\u0103 la trac\u021biune (MTS), reprezint\u0103 tensiunea maxim\u0103 pe care materialul o poate suporta \u00een stare \u00eentins\u0103 sau tras\u0103 \u00eenainte de a se deschide sau rupe. \u00cempreun\u0103 cu alte propriet\u0103\u021bi, aceast\u0103 caracteristic\u0103 are o mare importan\u021b\u0103 pentru dezv\u0103luirea comportamentului materialelor sub sarcin\u0103 de trac\u021biune. Aceasta poate ajuta la evaluarea adecv\u0103rii pentru diferite aplica\u021bii, de exemplu, \u00een inginerie sau produc\u021bie.<\/p>\n\n

Rezisten\u021ba la trac\u021biune se m\u0103soar\u0103, \u00een general, cu ajutorul unui test de trac\u021biune: \u00een timpul testului, materialul este \u00eentins p\u00e2n\u0103 la punctul de rupere dup\u0103 atingerea celei mai mari sarcini admisibile \u0219i este trasat pe curba tensiune-deformare. Punctul maxim \u043en aceast\u0103 curb\u0103 l\u0456k\u0435w\u0430r\u0435s t\u043e th\u0435 material tensile strength. Ecua\u021bia sigma = Pf\/Ao (semnalul este rezisten\u021ba la trac\u021biune \u00een N\/m2 sau Pascals; Pf este sarcina la rupere, iar Ao este aria sec\u021biunii transversale ini\u021biale) poate fi, de asemenea, utilizat\u0103 pentru a afla rezisten\u021ba la trac\u021biune.<\/p>\n\n

Tensiunea de for\u021b\u0103 este o proprietate asociat\u0103 care define\u0219te rezisten\u021ba care \u00eempiedic\u0103 materialul s\u0103 se clatine atunci c\u00e2nd este aplicat\u0103 o anumit\u0103 tensiune. Acest punct referitor la punctul de curgere este o zon\u0103 de tranzi\u021bie. Adic\u0103, materialul nu mai r\u0103m\u00e2ne \u00eentr-o stare elastic\u0103 dup\u0103 ce este eliminat\u0103 tensiunea aplicat\u0103.<\/p>\n\n

\"graficul
Graficul testului de rezisten\u021b\u0103 la trac\u021biune<\/figcaption><\/figure>\n\n

Revizuirile plictisitoare ale rezisten\u021bei implic\u0103 adesea alte marcaje, inclusiv rezisten\u021ba la fractur\u0103, rezisten\u021ba la rupere \u0219i tensiunea de fractur\u0103, care sunt denumiri alternative pentru unitatea de tensiune \u00een care corpul este rupt \u00een dou\u0103 fragmente distincte.<\/p>\n\n

Cunoa\u0219terea acestor propriet\u0103\u021bi este o necesitate pentru piesele tehnice \u0219i industriale. Acestea trebuie s\u0103 suporte solicit\u0103rile preconizate pe parcursul duratei lor de via\u021b\u0103. Propriet\u0103\u021bile sunt, de asemenea, esen\u021biale pentru selectarea materialelor \u021bin\u00e2nd cont de siguran\u021b\u0103, performan\u021b\u0103 \u0219i condi\u021bii variabile. De exemplu, temperatura poate afecta rezisten\u021ba la trac\u021biune a materialelor, cum ar fi cuprul.<\/p>\n\n

O compara\u021bie \u00een profunzime a rezisten\u021bei la cedare \u0219i a rezisten\u021bei la trac\u021biune<\/strong><\/h2>\n\n
\"Cum
Cum s\u0103 g\u0103si\u021bi rezisten\u021ba la curgere?<\/figcaption><\/figure>\n\n

Explicarea limitei elastice a delicate\u021bii \u0219i a ductilit\u0103\u021bii tensiunii<\/h3>\n\n

Rezisten\u021ba la curgere indic\u0103 tensiunea care este necesar\u0103 pentru deformarea plastic\u0103. Cu toate acestea, rezisten\u021ba la trac\u021biune determin\u0103 nivelul de tensiune la care for\u021ba determin\u0103 ruperea materialului. Rezisten\u021ba la curgere este proeminent\u0103 \u00een cazul materialelor care se deformeaz\u0103 (\u00eendoire sau forfecare), cum ar fi materialele ductile. \u00cen schimb, rezisten\u021ba la trac\u021biune este un atribut vital \u00een cazul materialelor fragile, care se rup foarte u\u0219or.<\/p>\n\n

Procesul de deformare \u0219i testare<\/h3>\n\n

\u00cen primul r\u00e2nd, dep\u0103\u0219irea limitei de elasticitate a materialelor macroscopice declan\u0219eaz\u0103 procesul de deformare a acestora. Apoi au loc testele de rezisten\u021b\u0103 la trac\u021biune care implic\u0103 deformarea. \u00cen cazul materialelor fragile, rezisten\u021ba la trac\u021biune poate fi v\u0103zut\u0103 ca punctul de curgere \u0219i este foarte implicat\u0103 \u00een deformarea mic\u0103.<\/p>\n\n

Considera\u021bii privind materialele \u00een proiectare<\/h3>\n\n

Fiabilitatea se ob\u021bine \u00een construc\u021bia structurilor din materiale care cedeaz\u0103 prin prioritizarea deform\u0103rii de cedare \u00een raport cu deformarea de trac\u021biune. Acest atribut le face materiale puternice \u0219i ductile, capabile s\u0103 fie deformate relativ mult \u00eenainte de a-\u0219i atinge rezisten\u021ba la trac\u021biune. \u00cen ceea ce prive\u0219te materialele fragile, „rezisten\u021ba la trac\u021biune” este factorul principal.<\/p>\n\n

Analiza tensiunilor \u00een proiectare<\/h3>\n\n

Rezisten\u021ba la curgere este studiat\u0103 pentru diferite st\u0103ri de tensiune experimentate pe mai multe axe, spre deosebire de rezisten\u021ba la trac\u021biune, care este uniaxial\u0103 \u0219i studiaz\u0103 \u00eenc\u0103rcarea pe o singur\u0103 ax\u0103. Odat\u0103 ce materialele \u00ee\u0219i dep\u0103\u0219esc limita de curgere, acestea se deformeaz\u0103 p\u00e2n\u0103 c\u00e2nd ajung la rezisten\u021ba la trac\u021biune, care \u00eencepe la o valoare numeric\u0103 mai mare.<\/p>\n\n

Acurate\u021bea m\u0103sur\u0103torilor<\/h3>\n\n

Rezisten\u021ba la trac\u021biune este susceptibil\u0103 de predic\u021bii inexacte \u00een majoritatea materialelor, inclusiv o\u021belul. Pe de alt\u0103 parte, \u00een loc ca rezisten\u021ba la trac\u021biune s\u0103 fie dificil de estimat \u00eenc\u0103 o dat\u0103, \u00een cazul materialelor precum o\u021belul, rezisten\u021ba la trac\u021biune poate fi calculat\u0103 exact. Cunoa\u0219terea diferen\u021belor dintre tr\u0103s\u0103turile puternice \u0219i cele slabe este necesar\u0103. Cu toate acestea, diferen\u021bierea \u00eentre ele este primordial\u0103 datorit\u0103 avantajelor practice.<\/p>\n\n

Cum s\u0103 selecta\u021bi materialul ideal pentru nevoile proiectului dumneavoastr\u0103\uff1f<\/h2>\n\n

Atunci c\u00e2nd decide\u021bi materialul potrivit pentru proiectul dvs., trebuie lua\u021bi \u00een considerare factorii de randament \u0219i de rezisten\u021b\u0103 la trac\u021biune. Ace\u0219ti indicatori arat\u0103 modul \u00een care materialul reac\u021bioneaz\u0103 la tensiune. Determinarea momentului \u0219i a modului de utilizare a acestor indicatori afecteaz\u0103 siguran\u021ba proiectului \u0219i rezultatul cu succes al acestuia. Uneori, luarea \u00een considerare at\u00e2t a rezisten\u021bei la trac\u021biune final\u0103, c\u00e2t \u0219i a rezisten\u021bei la curgere este o necesitate.<\/p>\n\n

Evaluarea limitelor de solicitare a materialelor<\/h3>\n\n

Acestea sunt informa\u021bii pe care ar trebui s\u0103 le cunoa\u0219te\u021bi deoarece indic\u0103 nivelul de tensiune pe care un material \u00eel poate suporta \u00eenainte de a se deforma sau rupe. \u00cen astfel de medii, unde pot exista tensiuni minime sau moderate, pot fi utilizate materiale cu o rezisten\u021b\u0103 mai sc\u0103zut\u0103 la trac\u021biune \u0219i elasticitate. Adecvarea materialului este extrem de important\u0103 pentru ca aceste proiecte s\u0103 suporte cele mai grele sarcini \u0219i solicit\u0103ri extreme. \u00cen consecin\u021b\u0103, rezisten\u021ba acestui material trebuie s\u0103 o dep\u0103\u0219easc\u0103 pe cea a for\u021belor din mediu.<\/p>\n\n

Echilibrarea propriet\u0103\u021bilor materialelor<\/h3>\n\n

Alegerea materialului adecvat este de o importan\u021b\u0103 cheie \u00een orice proiect dat. Printre acestea, trebuie s\u0103 ave\u021bi grij\u0103 de echilibrul dintre rezisten\u021ba la curgere, rezisten\u021ba la trac\u021biune \u0219i alte detalii. Acest vot influen\u021beaz\u0103 viabilitatea sistemului, care este afi\u0219at\u0103 \u00een siguran\u021b\u0103 \u0219i fiabilitate. Poate exista un efect \u00eentrep\u0103trunz\u0103tor al acestor propriet\u0103\u021bi asupra comportamentului materialelor. Prin urmare, cunoa\u0219terea acestor corela\u021bii joac\u0103 un rol semnificativ.<\/p>\n\n

Selectarea materialelor \u00een func\u021bie de necesit\u0103\u021bile de aplicare.<\/h3>\n\n

\u00cenceputul selec\u021biei materialului const\u0103 \u00een analizarea \u00een detaliu a obiectivelor proiectului dumneavoastr\u0103. Greutatea, temperatura \u0219i rezisten\u021ba la coroziune sunt factori care trebuie lua\u021bi \u00een considerare. Alinierea cu rezisten\u021ba materialului la solicit\u0103rile preconizate este un factor esen\u021bial \u00een determinarea performan\u021bei optime a materialului.<\/p>\n\n

Factorii care influen\u021beaz\u0103 alegerea materialului<\/h3>\n\n

Lua\u021bi \u00een considerare diver\u0219i factori atunci c\u00e2nd face\u021bi alegerea materialelor. Costul, disponibilitatea \u0219i prelucrabilitatea pot determina alegerea materialelor Un alt aspect de luat \u00een considerare sunt caracteristicile de mediu ale locului \u00een care inten\u021biona\u021bi s\u0103 utiliza\u021bi tehnologia.<\/p>\n\n

Rezisten\u021ba la \u00eentindere \u0219i la trac\u021biune a aliajelor comune<\/h2>\n\n
Material<\/td>Rezisten\u021ba la cedare<\/td>Rezisten\u021b\u0103 maxim\u0103<\/td><\/tr>
Imperial (ksi)<\/td>Metric (MPa)<\/td>Imperial (ksi)<\/td>Metric (MPa)<\/td><\/tr>
min.<\/td>max.<\/td>min.<\/td>max.<\/td>min.<\/td>max.<\/td>min.<\/td>max.<\/td><\/tr>
Aluminiu<\/td>1<\/td>1.6<\/td>7<\/td>11<\/td>7<\/td>28<\/td>48<\/td>193<\/td><\/tr>
Aluminiu bronz<\/td>32<\/td>45<\/td>221<\/td>310<\/td>78<\/td>85<\/td>540<\/td>585<\/td><\/tr>
Beriliu<\/td>35<\/td>50<\/td>240<\/td>345<\/td>45<\/td>51<\/td>310<\/td>370<\/td><\/tr>
Beriliu Cupru<\/td>140<\/td>175<\/td>965<\/td>1205<\/td>59<\/td>203<\/td>410<\/td>1480<\/td><\/tr>
Alam\u0103 (60\/40)<\/td>21<\/td>50<\/td>145<\/td>345<\/td>53<\/td>70<\/td>370<\/td>485<\/td><\/tr>
Alam\u0103 (galben)<\/td>15<\/td>61<\/td>105<\/td>425<\/td>47<\/td>91<\/td>325<\/td>625<\/td><\/tr>
Alam\u0103 (ro\u0219u)<\/td>12<\/td>63<\/td>83<\/td>435<\/td>40<\/td>84<\/td>275<\/td>580<\/td><\/tr>
Bronz<\/td>20<\/td>55<\/td>137<\/td>380<\/td>35<\/td>85<\/td>241<\/td>586<\/td><\/tr>
Cadmiu<\/td>9<\/td>9<\/td>64<\/td>64<\/td>9<\/td>11<\/td>62<\/td>78<\/td><\/tr>
Font\u0103 (gri)<\/td>14<\/td>40<\/td>98<\/td>276<\/td>22<\/td>63<\/td>140<\/td>431<\/td><\/tr>
Crom<\/td>29<\/td>36<\/td>200<\/td>250<\/td>39<\/td>42<\/td>270<\/td>290<\/td><\/tr>
Cobalt<\/td>19<\/td>29<\/td>135<\/td>200<\/td>33<\/td>101<\/td>230<\/td>700<\/td><\/tr>
Cupru<\/td>10<\/td>10<\/td>70<\/td>70<\/td>33<\/td>55<\/td>230<\/td>380<\/td><\/tr>
Aur (24K) pur<\/td>29<\/td>29<\/td>205<\/td>205<\/td>19<\/td>32<\/td>130<\/td>220<\/td><\/tr>
Fier<\/td>17<\/td>21<\/td>120<\/td>150<\/td>26<\/td>30<\/td>180<\/td>210<\/td><\/tr>
Fier (turnat)<\/td>14<\/td>40<\/td>98<\/td>276<\/td>22<\/td>63<\/td>140<\/td>431<\/td><\/tr>
Fier (forjat)<\/td>23<\/td>32<\/td>159<\/td>221<\/td>49<\/td>49<\/td>234<\/td>372<\/td><\/tr>
Plumb<\/td>0.72<\/td>2<\/td>5<\/td>19<\/td>1.7<\/td>4.6<\/td>12<\/td>32<\/td><\/tr>
Aliaj de magneziu<\/td>2.9<\/td>23<\/td>20<\/td>160<\/td>15<\/td>25<\/td>20<\/td>280<\/td><\/tr>
Nichel<\/td>20<\/td>50<\/td>140<\/td>350<\/td>45<\/td>110<\/td>310<\/td>760<\/td><\/tr>
Platin\u0103<\/td>5.5<\/td>26<\/td>38<\/td>180<\/td>17<\/td>20<\/td>120<\/td>140<\/td><\/tr>
Argint<\/td>8<\/td>8<\/td>55<\/td>55<\/td>20<\/td>46<\/td>150<\/td>360<\/td><\/tr>
O\u021bel (carbon)<\/td>35<\/td>100<\/td>248<\/td>690<\/td>49<\/td>276<\/td>340<\/td>1900<\/td><\/tr>
O\u021bel inoxidabil (304)<\/td>14<\/td>14<\/td>97<\/td>97<\/td>67<\/td>160<\/td>460<\/td>1100<\/td><\/tr>
O\u021bel inoxidabil (316)<\/td>13<\/td>13<\/td>96<\/td>96<\/td>67<\/td>125<\/td>460<\/td>860<\/td><\/tr>
Staniu<\/td>1.3<\/td>1.3<\/td>9<\/td>9<\/td>3<\/td>3<\/td>19<\/td>19<\/td><\/tr>
Titan<\/td>14<\/td>14<\/td>98<\/td>98<\/td>33<\/td>67<\/td>230<\/td>460<\/td><\/tr>
Tungsten<\/td>80<\/td>80<\/td>550<\/td>550<\/td>100<\/td>500<\/td>689<\/td>3447<\/td><\/tr>
Zinc<\/td><\/td><\/td><\/td><\/td>20<\/td>21<\/td>135<\/td>145<\/td><\/tr>
(Sursa tabelului: https:\/\/www.engineeringtoolbox.com\/young-modulus-d_417.html<\/mark><\/a>)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

Concluzie<\/strong><\/h2>\n\n

Alegerea materialului potrivit implic\u0103 o \u00een\u021belegere profund\u0103 a rezisten\u021bei la \u00eentindere \u0219i la trac\u021biune. Aceste cuno\u0219tin\u021be asigur\u0103 faptul c\u0103 proiectul dvs. va rezista tuturor solicit\u0103rilor opera\u021bionale, sporind astfel durabilitatea \u0219i performan\u021ba.<\/p>\n\n

Colabora\u021bi cu noi pentru consultan\u021b\u0103 de specialitate \u00een selectarea materialelor pentru a optimiza performan\u021ba \u0219i siguran\u021ba proiectului dumneavoastr\u0103. S\u0103 construim succesul \u00eempreun\u0103!<\/p>\n","protected":false},"excerpt":{"rendered":"

Atunci c\u00e2nd \u00eencepe\u021bi un proiect, selectarea materialului potrivit este esen\u021bial\u0103. \u00cen\u021belegerea randamentului \u0219i a rezisten\u021bei la trac\u021biune ajut\u0103 inginerii \u0219i proiectan\u021bii s\u0103 aleag\u0103 materialele care r\u0103spund cel mai bine nevoilor lor specifice.<\/p>\n","protected":false},"author":1,"featured_media":25274,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-25392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized-ro"],"yoast_head":"\nRezisten\u021ba la \u00eentindere VS rezisten\u021ba la trac\u021biune: \u00cen\u021belegerea diferen\u021belor cheie - ChansMachining<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/chansmachining.com\/ro\/rezistenta-la-intindere-vs-rezistenta-la-tractiune-intelegerea-diferentelor-cheie\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rezisten\u021ba la \u00eentindere VS rezisten\u021ba la trac\u021biune: \u00cen\u021belegerea diferen\u021belor cheie - 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