This paper analyzes the nonlinear deformational process of the envelop structure and the cause of stiffness matrix singularity in details.
本文详细地分析了囊体结构的非线性变形过程及刚度矩阵出现奇异的原因；
The formation process of graphite and matrix structure in high strength synthetic casting iron was analyzed and compared with the microstructure of common grey iron.
分析了高强度合成铸铁中石墨和基体组织的形成过程，并将其与普通灰铸铁的显微组织进行对比。
Our study was found that two main reasons making the circular saw blades matrix distortion in quenching were banded structure and the unreasonable quenching process.
研究发现，原材料的带状组织和淬火工艺的不合理是造成锯片基体淬火变形的两个主要原因。
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