Study of Specimen Sizes Needed for Estimating Strength of Dissimilar Joint

为了估算异种材料的接头强度以及试件尺寸对接头强度的影响，进行了接头界面脱温实验。接头是由树脂固化在钢上制成的。采用热电偶和目测相结合的方法测量了去除温度。实验结果表明，当树脂宽度大于树脂厚度的8倍，钢材厚度大于树脂厚度的2倍时，去除温度趋于恒定。虚拟裂纹长度的能量释放率g值是预测去除温度的有用参数，它存在于由不同材料和楔形角组合而成的拐角附近的奇异场内。

Experiments on removing temperature at an interface of bonded joint have been made for estimating the joint strength of dissimilar materials and the effect of specimen sized on the strength. The joint was made by a resin curing on a steel. The removing temperature was measured by a thermo-couple and a visual observation. It is shown from the experimental results that the removing temperature becomes constant when the width of resin is greater than 8 times as long as the thickness of resin and the thickness of steel is greater than twice as long as that of resin. The energy release rate g -value of a virtual crack length, which exists within the singular field in the vicinity of the corner caused by a combination of dissimilar materials and a wedge angle, is useful parameter for predicting the removing temperature.