Experimental investigations of the effect of thickness on fracture toughness of metallic foils
Experimental investigations of the effect of thickness on fracture toughness of metallic foils
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DOI：
10.1016/j.msea.2004.11.044
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发表时间：
2005-03
期刊：
影响因子：
6.4
通讯作者：
Yi-lan Kang;Zhi-feng Zhang;Huaiwen Wang;Q. Qin
中科院分区：
文献类型：
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作者：
Yi-lan Kang;Zhi-feng Zhang;Huaiwen Wang;Q. Qin
实验研究了厚度对金属箔断裂韧性JC的影响。对厚度t为0.02 ~ 1 mm的铜箔制成的双边裂纹试样进行拉伸试验。数字散斑相关方法（DSCM）被用来评估周围的裂纹尖端的应变场，允许确定的J积分。断裂韧性定义为裂纹萌生时的J积分值，随厚度的增加而增加，然后在厚度约为0.3mm时达到最大值，最后在较大厚度时降低。光学和扫描电子显微镜（SEM）的结果表明，这种显着的影响的厚度基本上是由于在裂纹尖端颈缩过程中的每单位面积所需的工作和材料分离过程中的每单位面积所需的工作的变化。
The effect of thickness on the fracture toughness JCof metallic foil was investigated experimentally. Double-edge cracked specimens, made of copper foils with thicknesses t ranging from 0.02 to 1mm, were loaded in tension till fracture. The digital speckle correlation method (DSCM) was used to evaluate the strain fields around the crack tip, allowing determination of the J integral. The fracture toughness defined as the value of the J integral at cracking initiation was shown to first increase with increasing thickness, then to reach a maximum for a thickness of about 0.3mm and finally to decrease at larger thicknesses. Optical and scanning electron microscopy (SEM) results showed that this significant effect of thickness is essentially attributable to the change in the work required per unit area during crack tip necking and in the work required per unit area during material separation.