82B yog qhov siab - carbon caij nplooj ntoos hlav hlau uas muaj lub zog siab thiab tawv, tab sis nws muaj kev nkag siab zoo rau kev suav nrog, kev sib cais, qhov tsis xws luag, kev ntxhov siab, thiab ib puag ncig. Lub caij nplooj ntoos hlav tsis ua haujlwm feem ntau tsis yog tshwm sim los ntawm ib qho, tab sis yog kev sib koom ua ke ntawm cov khoom siv, kev tsim khoom, thiab kev ua haujlwm. Hnub no peb yuav tham txog theem yim: Load Conditions: Pure Mechanical Failure.

8. Load Conditions: Pure Mechanical Failure

8.1 Fatigue Fracture

• Teeb meem: Lub caij nplooj ntoos hlav bears cyclic loads rau lub sij hawm ntev, thiab qhov kev ntxhov siab amplitude tshaj qhov tso cai ntawm cov khoom los yog tsim.
• Mechanism: Cyclic loads ua rau microcracks pib hauv qhov chaw tsis xws luag, suav nrog, lossis siab - thaj chaw muaj kev ntxhov siab. Cov kab nrib pleb nthuav tawm me ntsis nrog txhua lub voj voog, thiab thaum kawg tus ntoo khaub lig seem -section tsis tuaj yeem ris lub nra thiab snaps instantaneously.
• Qhov tshwm sim:

Fracture nyob rau hauv rated lifespan

Fracture nto qhia tias qaug zog propagation tsam thiab instantaneous tawg tsam

System downtime

Muaj kev nyab xeeb

8.2 Kev Nyuaj Siab Kev Nyuaj Siab thiab Kev Txhim Kho tas mus li

• Teeb meem: Lub caij nplooj ntoos hlav yog nyob rau hauv lub siab compression lub sij hawm ntev, los yog kev ua hauj lwm kev nyuaj siab yog nyob ze rau lub yield txwv.
• Mechanism: Dislocations nyob rau hauv cov khoom txav maj mam, thiab ib feem ntawm cov elastic deformation yog hloov mus rau hauv unrecoverable yas deformation, ua rau lub load txo lub sij hawm.
• Qhov tshwm sim:

Dawb qhov siab yuav luv dua

Caij nplooj ntoos hlav quab yuam attenuation

Poob ntawm preload quab yuam

Mechanism kev ua tsis tiav

8.3 Impact Overload Fracture

• Teeb meem: Instantaneous impact loads over the design values ​​in the working condition.
• Mechanism: 82B muaj lub zog siab tab sis tsis tshua muaj zog. Qhov cuam tshuam load ua rau lub sijhawm luv luv thiab lub zog yog concentrated. Cov khoom siv tsis tuaj yeem nqus tau lub zog cuam tshuam los ntawm cov yas deformation thiab ua rau tawg tawg.
• Qhov tshwm sim:

Instantaneous snapping

Yam ya tawm

Kev puas tsuaj rau cov khoom siv peripheral

Kev nyab xeeb

8.4 Resonance thiab Dynamic Stress Amplification

• Teeb meem: Lub sijhawm ua haujlwm yog ze rau lub ntuj zaus ntawm lub caij nplooj ntoos hlav.
• Mechanism: Resonance yuav ua rau kom lub amplitude ntawm lub caij nplooj ntoos hlav, thiab qhov tseeb dynamic kev nyuaj siab yog ntau dua li qhov zoo li qub tsim kev ntxhov siab. Kev sib tsoo, coil sib tsoo, lossis kev sib txhuam hauv zos tuaj yeem tshwm sim ntawm cov coils.
• Qhov tshwm sim:

Caij nplooj ntoos hlav heats li

Kev puas tsuaj saum npoo

Accelerated qaug zog tawg propagation

Kev ua haujlwm sai poob qis

8.5 Nto Microcrack Propagation

• Teeb meem: me me khawb, indentations, los yog cov kab nrib pleb sab laug thaum tsim los yog machining.
• Mechanism: Nyob rau hauv cov neeg kho tshuab kev ua haujlwm dawb huv, kev ntxhov siab nyob rau hauv qab ntawm qhov chaw tsis xws luag, thiab cov kab nrib pleb rov qhib thiab kaw, maj mam nthuav mus rau sab hauv.
• Qhov tshwm sim:

Thaum ntxov qaug zog tawg

Fracture pib los ntawm qhov chaw ruaj khov

Cov kev tsis zoo sib xws ua rau kev ua tsis tiav batch