摘要
本文研究了陶瓷材料在纯弯曲应力状态下的受拉区和受压区的变形,和弹性模量及泊松比的差异。实验采用四点弯曲、样条上下表面贴正交应变片的方法。结果表明陶瓷材料在弯曲时的拉弹性模量大于压弹性模量,拉泊松比小于压泊松比,而且这种差异随着应力的增加而增加。文中导出了中性层的位置。对于精细陶瓷,当忽略拉、压弹性模量的差异,按传统方法计算弯曲强度的误差不大于5%。
Strain, elastic modutu and poisson's ratio in the tensile zone and the compressive zone rispectively for ceramic specimens were investigated under bending load. Orthagonal strain gauges were adhered on the upper surface and lower surface of the specimen respectively and four-point bending test was performed. Experimental results show that, as for ceramic materials, the tensile elastic modulus is higher than the compressive elastic modulus under bending stress, but the tensile poisson's ratio is lower than the compressive one, and such difference increases wicth the increase of stress. The position of neutral layer of the section is derived in this paper. When neglecting the difference between the tensile and compressive elastic modulus, the error of the calculated bending strength rased on traditional method will be not greater than 5%.
出处
《中国建材科技》
1993年第1期3-7,共5页
China Building Materials Science & Technology
关键词
弯曲应力
陶瓷材料
力学性质
bending stress, elastic modulus, neutral layer, stress gradient.
