Determination method of fatigue strength and precursors of fatigue failure of porous weakly cemented siltstone [PDF]
, 2023 In order to study the fatigue behavior of porous weakly cemented siltstone, a quantitative calculation method of characteristic stress was established based on uniaxial step loading and unloading tests of siltstone.
Hui WANG +4 more
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Effects of Loading Sequence on Fatigue Damage Accumulation of Asphalt Mixture
, 2023 The accumulation process of fatigue damage of asphalt mixture under variable amplitude loading exhibits an obvious nonlinear characteristic. However,the traditional linear damage accumulation criterion fails to characterize the nonlinear fatigue damage ...
Fang, C +6 more
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智能城市应用, 2023 在冶金工业厂房中重级制吊车的运行区域，工字形钢吊车梁腹板与上翼缘连接处经常出现疲劳损伤，对生产安全带来了极大的威胁，所以确认钢吊车梁该处发生疲劳损伤的原因并进行加固具有重要意义。本篇文章以某实际项目为例，建立全尺寸全系统的有限元计算模型，分析吊车梁腹板与上翼缘连接处出现损伤的原因，并且确定加固方案后，对比加固前后以及不同加固方案下的腹板抗疲劳性能，为吊车梁的抗疲劳设计提供有效的指导。
佳玲 李, 少博 皮, 韫鑫 李
semanticscholar +1 more source
Study on the damage law of coal rock affected by different alternating periods of cold and heat [PDF]
, 2023 Temperature is an important factor affecting the physical properties of coal and rock, and as a solid medium, coal and rock have the properties of thermal expansion and contraction.
Hewan LI +4 more
core +1 more source
Study on evolution law of mechanical properties of coal samples subjected to freezing and freeze-thaw cycles of liquid nitrogen [PDF]
, 2023 The permeability of coal reservoir is generally low in China, how to effectively improve the permeability of coal reservoir is a key and difficult point of coalbed methane exploitation, Liquid nitrogen fracturing technology as a kind waterless fracturing
Dongming ZHANG +6 more
core +1 more source
Study on fatigue life prediction method of composite laminates
Xibei Gongye Daxue Xuebao, 2022 Advanced composites have been widely used in aerospace field and transportation field in ground due to their excellent mechanical properties. Fatigue damage and life prediction of composites have always been the important and difficult issues in the ...
TUO Hongliang +3 more
doaj +1 more source
Effects of cooling velocity on multiaxial fatigue behavior of A319 alloy under circular loading conditions [PDF]
, 2017 The effects of cooling velocity on the multiaxial fatigue properties of A319 alloy under circular loading conditions was studied by using the MTS809 servo-hydraulic testing system and scanning electron microscopy.
DAI Li-quan +5 more
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Jianzhu Gangjiegou Jinzhan, 2022 针对钢桥中钢板疲劳裂纹进行了一系列疲劳裂纹修复试验研究，以确定不同修复方法下结构的疲劳性能。高弹模CFRP（碳纤维增强复合材料）修复法是通过粘贴高弹模CFRP布来增大结构刚度，以延长结构疲劳寿命，且碳纤维材料基本不会产生疲劳裂纹，具有较好的抗疲劳效果。采用数值模拟和试验研究相结合的方法，首先对修复钢板的应力分布和特点进行了详细的分析，然后通过3组对比疲劳试验，确定了不同修复方法对损伤钢板疲劳寿命的增强效果。最后利用修复试验值与各国规范规定的S-N曲线进行比较，分析已修复钢板的疲劳性能。研究结果表明 ...
吕志林 +4 more
doaj
Effect of bolt tightening torque on fatigue life of multi-bolted composite structure
Xibei Gongye Daxue Xuebao, 2023 Bolt tightening torque has an influence on the fatigue life of the multi-bolted joints which cannot be ignored, but there are few methods to predict the fatigue life of the multi-bolted composite structure by considering the bolt tightening torque.
DONG Jiachen +4 more
doaj +1 more source
Prediction of fretting damage and wear fatigue of floating involute spline couplings
Xibei Gongye Daxue Xuebao, 2022 In this paper, a finite element model of the floating spline pair is first established, and the distribution of the contact pressure on the tooth surface of the spline with the axis and angular misalignment is analyzed.
XIAO Li +4 more
doaj +1 more source