Using the Stress Concentration Factor in Determining the Fracture Toughness

IF 0.6 4区 工程技术 Q4 MECHANICS Mechanika Pub Date : 2022-10-21 DOI:10.5755/j02.mech.31226
Goksel Saracoglu
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Abstract

This paper offers the use of stress concentration factor in determining the critical fracture stress and fracture toughness of polymeric composite materials at various crack length ratios. The stress intensity factor has been turned into a function of the stress concentration factor derived from the maximum stress occurring at the notch tip and the tip stress generated by the force applied to the sample. This conversion allowed the use of a fixed theoretical radius (1.2732 mm) instead of the actual radius of the notch or crack. On the edge cracked three-point bending and tensile samples, the specified method detects the three point bending fracture stresses with a maximum error rate of 1.2%. This study also establishes a relationship between the clamped end and the pin-loaded tensile specimens and states that the underlying mechanism of the stress intensity factor of the clamped end tensile specimen is based on the normalization of the stress intensity factor of the pin-loaded conditions with the geometric correction factor.
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用应力集中系数测定断裂韧性
本文提出了应力集中因子在确定聚合物复合材料在不同裂纹长度比下的临界断裂应力和断裂韧性方面的应用。应力强度因子已转化为应力集中因子的函数,该应力集中系数源自在缺口尖端处发生的最大应力和由施加到样品的力产生的尖端应力。这种转换允许使用固定的理论半径(1.2732毫米),而不是缺口或裂纹的实际半径。在边缘裂纹的三点弯曲和拉伸样品上,规定的方法检测三点弯曲断裂应力,最大误差率为1.2%。本研究还建立了夹持端和销加载拉伸试样之间的关系,并指出夹持端拉伸试样应力强度因子的潜在机制是基于销加载应力强度因数的归一化具有几何校正因子的条件。
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来源期刊
Mechanika
Mechanika 物理-力学
CiteScore
1.30
自引率
0.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.
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