Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 26, No. 10 (October 2013) 1203-1212   

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  PLASTICITY EFFECT ON RESIDUAL STRESSES MEASUREMENT USING CONTOUR METHOD
 
A .H. Mahmoudi, A. R. Hosseinzadeh and M. Jooya
 
( Received: May 01, 2013 – Accepted: May 16, 2013 )
 
 

Abstract    Residual stresses have become an important player in the field of the structural integrity for many years. Having an exact knowledge of residual stress distributions can be essential in designing the engineering components as unexpected failures are inevitable where such stresses are ignored. There are many residual stresses measurement techniques including destructive and non-destructive ones. Among the mechanical strain relief (MSR) techniques, contour method is one of the youngest. Contour Method relies on the material removal similar to other MSR techniques. In this method a part is carefully cut into two pieces along a flat plane, causing the residual stress normal to the cutting plane to relax. However, similar to other MSR techniques, plasticity can have a great influence on the accuracy of the results. In the present work, effect of plasticity on the residual stress measurement using contour method is investigated. Quenching is employed to induce residual stresses within the samples. To create different levels of plasticity, the samples were quenched at three different temperatures, 500°C, 700°C and 850°C. The residual stresses were then measured using contour method. Furthermore, the contour method procedure is simulated using finite element analysis to compare with the experimental results.

 

Keywords    Contour method, Residual stress, Plasticity, Finite element

 

چکیده    چكيده تنش‌های پسماند نقشی بسیار حیاتی در یکپارچگی سازه‌ها ایفا می‌کنند. اندازه‌گیری این تنش‌ها و تعیین توزیع دقیق آن‌ها در طراحی‌های مهندسی بسیار ضروری به نظر می‌رسد. صرف‌نظر از تنش‌های پسماند می‌تواند باعث ازکارافتادگی‌های غیر منتظره و زودرس فطعات گردد. روش‌های اندازه‌گیری مخرب و غیر‌مخرب زیادی برای اندازه‌گیری تنش‌های پسماند وجود دارد. از میان روش‌هایی که بر اساس آزادسازی مکانیکی کرنش استوارند، روش کانتور یکی از جدیدترین‌هاست. در این روش نیز مانند سایر روش‌های مکانیکی بخشی از ماده از قطعه حذف می‌شود. در این روش قطعه به دو بیم بریده شده و باعث می‌شود مولفه عمود بر سطح تنش پسماند آزاد گردد. مانند سایر رو.ش‌های مکانیکی، اثر پلاستیسیته می‌تواند از دقت اندازه‌گیری با این روش کم کند. در این مقاله اثر پلاستیسیته در اندازه‌گیری تنش پسماند بروش کانتور بررسی می‌گردد. از روش کوئنچ برای ایجاد تنش‌های پسماند در نمونه‌ها استفاده شده است. نمونه‌ها در سه دمای °C500، °C700 و °C850 کوئنچ می‌شوند و تنش‌های پسماند آن‌ها بروش کانتور اندازه‌گیری می‌شوند. همچنین با استفاده از روش اجزاء‌محدود مرحله کوئنچ و کانتور شبیه‌سازی شده و با نتایج تجربی مقایسه می‌شوند

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