论文部分内容阅读
将胶结颗粒理想化为两铝棒在指定位置处形成胶结,根据铝棒间胶结物厚度的不同,分别定义为有厚度胶结颗粒和无厚度胶结颗粒,对上述两种胶结颗粒进行一系列力学试验(包括:拉伸、压缩、压剪、压扭和复杂应力试验),从而对理想胶结颗粒的微观力学特性进行试验研究。试验结果表明:胶结厚度和法向压力对胶结颗粒的力学性能影响显著,随着胶结厚度的增大,试样的抗拉强度和延性均增大,其抗压特性由塑性硬化向塑性软化转变。无厚度试样抗剪和抗扭强度始终随法向压力的增大而增大,而有厚度试样则先随法向压力的增大而增大,当法向压力超过某一数值后,其强度又随着法向压力的增大而减小。在三维应力空间中(法向压力–扭矩–剪力)无厚度胶结颗粒的强度包线呈椭圆抛物面状,而有厚度胶结颗粒强度包线呈水滴状。
The cement particles idealized as two aluminum rods in the designated position to form a cementation, according to the thickness of the cement between the different bars were defined as the thickness of the cement particles and non-thickness cemented particles, the two kinds of cement particles were subjected to a series of mechanical tests (Including: stretching, compression, compression shear, compression and complex stress test), the microstructure and mechanical properties of the ideal cement particles were studied. The results show that the cemented thickness and the normal pressure exert a significant influence on the mechanical properties of the cemented particles. With the increase of the cemented thickness, the tensile strength and ductility of the cemented samples increase, and their compressive properties change from plastic solidification to plastic softening . Shear strength and torsion strength of non-thickness specimen always increase with the increase of normal pressure, while thickness specimens increase with normal pressure first. When the normal pressure exceeds a certain value, Its intensity decreases with the increase of normal pressure. In the three-dimensional stress space (normal pressure-torque-shear), the thickness of the non-thickness cement particles is elliptic paraboloid, while that of the cement particles with thickness is droplet.