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STRESS RELAXATION AND RELIABILITY EVALUATION OF SODA-LIME GLASS
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作者 Y.W.Bao Y.F.Han F.T.Gong 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第4期460-464,共5页
Stress relaxation of glass is a dualism effect, it often lead to strength degradation in strengthened glass, but on the other hand, it improves the reliability and stress-uniformity of glasses. In this work, stress re... Stress relaxation of glass is a dualism effect, it often lead to strength degradation in strengthened glass, but on the other hand, it improves the reliability and stress-uniformity of glasses. In this work, stress relaxation of soda-lime glass was investigated using three-point bending tests at 400-560℃ which is near the brittle to ductile transition temperature, for enhancing the safety of glass productions and exploring the most economic anneal process. The experimental results show that the speed of stress relaxation increases but the ultimate stress decreases with increasing temperature. The stress uniformity of the glass samples before and after anneal was examined using spherical indentation at arranged testing points. It indicates that the scatter of the local strength measured by the Hertzian indentation is smaller in the anneal glass than in initial specimen, so that the estimated Weibull modulus for the anneal specimen is higher. Furthermore, the strength evaluation by Hertzian indentation and statistical analysis was presented. 展开更多
关键词 glass stress relaxation local strength reliability
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钢化玻璃自爆机理与自爆准则及其影响因素 被引量:30
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作者 包亦望 刘正权 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2016年第4期401-406,共6页
钢化玻璃应用广泛,但其自爆问题是一个被称为玻璃癌症的难题,其特征是突发性和灾难性,因此如何减少和预防预测玻璃自爆是钢化玻璃工程应用领域的关键问题。本文重点探讨了钢化玻璃的自爆机理,揭示了钢化玻璃为什么会自爆,什么条件下可... 钢化玻璃应用广泛,但其自爆问题是一个被称为玻璃癌症的难题,其特征是突发性和灾难性,因此如何减少和预防预测玻璃自爆是钢化玻璃工程应用领域的关键问题。本文重点探讨了钢化玻璃的自爆机理,揭示了钢化玻璃为什么会自爆,什么条件下可能自爆和各种影响玻璃自爆的内在与外在因素。研究发现由于杂质和缺陷引起的应力集中是导致自爆的关键因素,证明钢化玻璃内部的残余应力和局部强度均是非线性分布,局部强度在玻璃表面最高,中间层最低,自爆的根本原因是内部的应力集中超过了局部强度,而传统认识的硫化镍或单质硅等各种杂质只是引起自爆的间接原因。提出的钢化玻璃自爆准则为玻璃破碎分析提供了有用的参考。 展开更多
关键词 钢化玻璃 自爆 局部强度 残余应力
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高压断路器储能弹簧的可靠性及寿命分析 被引量:24
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作者 田涛 张兆君 +3 位作者 朱超 陈昊 王阳英夫 张建忠 《电力工程技术》 2017年第5期103-108,共6页
本文介绍了机械可靠性分析中应力-强度干涉模型的基本概念,给出了圆柱螺旋弹簧的可靠度计算模型,结合强度退化模型,将断路器储能弹簧的可靠度与其操作次数相关联,考察储能弹簧的可靠度随操作次数增加而降低的现象。根据应力松弛模型,在... 本文介绍了机械可靠性分析中应力-强度干涉模型的基本概念,给出了圆柱螺旋弹簧的可靠度计算模型,结合强度退化模型,将断路器储能弹簧的可靠度与其操作次数相关联,考察储能弹簧的可靠度随操作次数增加而降低的现象。根据应力松弛模型,在考虑强度退化的可靠度计算模型上结合应力松弛相关的因子,建立考虑强度退化与应力松弛的应力-强度干涉模型,分析了断路器储能弹簧的预期寿命,并以某断路器储能弹簧为算例,验证了该方法的可行性。 展开更多
关键词 可靠度 强度退化 应力松弛 断路器
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Reliability analysis of ship structure system with multi-defects 被引量:3
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作者 AN Hai 1,AN WeiGang 1 & ZHAO WeiTao 2 1 School of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China 2 School of Aeronautics and Astronautics,Shenyang Institute of Aeronautical Engineering,Shenyang 110034,China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2010年第11期2113-2124,共12页
This paper analyzes the influence of multi-defects including the initial distortions,welding residual stresses,cracks and local dents on the ultimate strength of the plate element,and has worked out expressions of rel... This paper analyzes the influence of multi-defects including the initial distortions,welding residual stresses,cracks and local dents on the ultimate strength of the plate element,and has worked out expressions of reliability calculation and sensitivity analysis of the plate element.Reliability analysis is made for the system with multi-defects plate elements.Failure mechanism,failure paths and the calculating approach to global reliability index are also worked out.After plate elements with multi-defects fail,the formula of reverse node forces which affect the residual structure is deduced,so are the sensitivity expressions of the system reliability index.This ensures calculating accuracy and rationality for reliability analysis,and makes it convenient to find weakness plate elements which affect the reliability of the structure system.Finally,for the validity of the approach proposed,we take the numerical example of a ship cabin to compare and contrast the reliability and the sensitivity analysis of the structure system with multi-defects with those of the structure system with no defects.The approach has implications for the structure design,rational maintenance and renewing strategy. 展开更多
关键词 initial DISTORTIONS welding RESIDUAL stresses cracks and local defects ULTIMATE strength REVERSE node FORCES sensitivity expression reliability analysis
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