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Experimental studies of Mode i energy release rate in adhesively bonded width tapered composite DCB specimens

机译:粘结宽度渐缩复合DCB样品中i型能量释放率的实验研究

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The Mode I energy release rate, G_I, derived from conventional uniform width double cantilever beam (DCB) test data depends on crack length. Data acquisition and analysis from such experiments can be simplified if G_I is independent of crack length, particularly at high loading rates. Previous research by others has shown that width tapered double cantilever beam (WTDCB) specimens made from aerospace grade carbon/epoxy composite laminates without adhesive layers exhibit critical energy release rates which are independent of crack length. The purpose of the present investigation was to determine whether or not adhesively bonded WTDCB specimens of automotive type sheet molding compound (SMC) composites show similar behavior. It was observed that the critical energy release rate was practically independent of crack length for unidirectional carbon/epoxy WTDCB specimens without adhesive layers but not for unidirectional carbon/epoxy, unidirectional E-glass/epoxy or automotive SMC WTDCB specimens with adhesive layers, and that self-similar crack growth only occurred in unidirectional carbon/epoxy WTDCB specimens without adhesive layers.
机译:从常规均匀宽度双悬臂梁(DCB)测试数据得出的I型能量释放速率G_I取决于裂纹长度。如果G_I与裂纹长度无关,尤其是在高加载速率下,则可以简化此类实验的数据采集和分析。其他人的先前研究表明,由航空级碳/环氧树脂复合材料层压板制成的不带胶粘层的宽度渐缩双悬臂梁(WTDCB)样品,其临界能量释放速率与裂纹长度无关。本研究的目的是确定汽车类型片状模塑料(SMC)复合材料的粘合WTDCB标本是否表现出相似的行为。观察到,对于没有粘合剂层的单向碳/环氧树脂WTDCB样品,临界能量释放速率实际上与裂纹长度无关,但是对于具有粘合剂层的单向碳/环氧树脂,单向电子玻璃/环氧树脂或汽车SMC WTDCB样品,临界能量释放速率实际上与裂纹长度无关。自相似的裂纹扩展仅发生在无粘结层的单向碳/环氧树脂WTDCB试样中。

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