Study of the Deformation and Strength of the New Materials (Biomaterial, Ceramic,Rock etc.) by Speckle Photography Method.

本课题的研究目的是利用散斑摄影方法获取生物材料、陶瓷、岩石等“新材料”的变形和断裂的基础数据。散斑摄影的特点是非接触的局部应变测量，包括高温状态。1984年，本项目第一年，我们制作了电炉、加载机和陶瓷卡盘，用于加载三点弯曲试验，用于断裂韧性测量。作为本项目的第一步，我们尝试测量岩石（陶瓷）裂纹尖端在25℃~ 500℃温度范围内的局部应变分布，我们成功地评估了裂纹尖端的K值，在小试件中发现K值比理论背景计算值要小。该实验结果对评价构件在高温下的强度有一定的参考价值。接下来，我们成功地将该方法应用于新型功能性、形状记忆效应的Ni-Ti合金调色板的力学行为测量。

The aim of this reserach project is to get the basic data with the deformation and fracture of the "New Materials" such as biomaterial,cermic and rock etc. by using Speckle Photography Method. Speckle Photography is charcterized by the non-contact local strain measurement including elevated temperature regime. In 1984,first year of this project,we made the electric furnace, loading machine and ceramic chuck for loading three-points bending test for fracture toughness measurement. As a first step of this project,we tried to measure the local strain distribution around a crack-tip of rock (ceramic) at the temperature range from 25 C to 500 C, and we succeeded in evaluating the K value at the crack-tip, whith was found to be smaller in small test specimen than the calculated value from theoretical background. This experimental result seems to be valuable for evaluating the strength of components in elevated temperature. Next,we applied this method successfuly to measuring the mechanical behavior of new functional, shape memory effect of Ni-Ti alloy palte.