裂纹扩展 - Open Access .click

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Dianci bileiqi, 2017
电瓷的无机粘接及对其表面进行少量的无机修复,都需要进行多次烧成,但对多次烧成对其性能的影响却缺少系统的讨论。本文将试条随同批电瓷产品进行多次烧成,通过测量试条的抗折强度及其强度分散性、显微结构特征及物相成分,讨论了多次烧成对电瓷机械性能的影响。结果表明:随着试条烧成次数的增加,抗折强度有小幅度下降,且强度分散性增大,上釉坯体中这种现象更明显。多次烧成后,晶体异常长大现象并不明显,但石英颗粒周围存在着微裂纹增多且出现扩展现象;主晶相莫来石-石英的量有一定程度减少,且析出了少量方石英相 ...
徐小燕 +4 more
doaj

海洋石油结构钢低温疲劳实验系统的研究 [PDF]

, 1995
为解决石油平台在辽东湾海域的低温疲劳问题，借助ＭＴＳ试验机，建立一套低温疲劳实验系统，实现了低温疲劳实验中疲劳裂纹的观察和测量，以获取平台结构钢在低温下的疲劳裂纹扩展速率的可靠数据 ...
张兴钧 +4 more
core

Water inrush mechanism and the minimum safety thickness of the rock wall of a tunnel crossing a fault fracture zone [PDF]

Objective With the relocation of major national strategic plans to western China, railway construction has gradually focused on the complex and dangerous mountainous regions of Yunnan, Sichuan, and Xizang Provinces, where the proportion of tunnels along
XIAO Kun, YUAN Dong
core +1 more source

Influence of the position and depth of pre-cutting kerfs on the rock breaking by SBM cutter [PDF]

The combination of water-jet and disc-cutter rock breaking is a key technology to improve the rock breaking efficiency of the full-face shaft boring machine and achieve the mechanized development of deep resources.
Chenxi DING +5 more
core +1 more source

An efficient nesting sub-domain gradient smoothing integration algorithm for Galerkin meshfree methods [PDF]

, 2016
·无网格法直接通过节点信息建立形函数，不依赖于节点之间的有序拓扑连接，能够建立任意高阶连续的整体协调形函数和位移场。在过去的二十多年里，无网格法得到了快速发展，在许多领域得到了成功应用，例如，裂纹扩展模拟，板壳分析，大变形模拟和断裂破坏模拟等。然而，由于无网格形函数一般不是多项式，且各个形函数的支撑域与背景积分子域通常不重合，因而伽辽金无网格法为了保证计算精度，需要在每个背景积分子域内采用高阶的高斯积分方法进行数值积分。但高阶高斯积分会明显降低无网格法的计算效率，不利于无网格法的大规模工程应用。因此 ...
吴俊超
core

[Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants]. [PDF]