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环氧树脂在高应变率下的热粘弹性本构方程和时温等效性 被引量:44
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作者 朱兆祥 徐大本 王礼立 《宁波大学学报(教育科学版)》 CAS 1988年第1期58-68,共11页
在—20℃~100℃的温度范围内用SHPB实验技术研究了环氧树脂在高应变率(10~2~10~3s^(-1))和直到7.5%大应变下的粘弹性力学行为。提出了一个简单实用的非线性热粘弹性本构方程,并发现存在一种时温等效性。在加卸载全过程中,理论计算值... 在—20℃~100℃的温度范围内用SHPB实验技术研究了环氧树脂在高应变率(10~2~10~3s^(-1))和直到7.5%大应变下的粘弹性力学行为。提出了一个简单实用的非线性热粘弹性本构方程,并发现存在一种时温等效性。在加卸载全过程中,理论计算值与实验结果相当符合。 展开更多
关键词 环氧树脂 本构方程 SHPB实验技术 高应变率 弹性力学行为时温等效性
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纤维增强复合材料的热黏弹性能 被引量:1
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作者 许家宝 周储伟 周逃林 《工程塑料应用》 CAS CSCD 北大核心 2018年第12期110-114,共5页
建立了纤维增强复合材料的热黏弹性力学模型。模型中环氧树脂基体相与温度相关的黏弹性采用三元件模型模拟,模型参数通过热机械动力学分析实验测定,基于黏弹性–弹性对应性原理,采用复刚度法建立了单向和层合复合材料不同温度条件下的... 建立了纤维增强复合材料的热黏弹性力学模型。模型中环氧树脂基体相与温度相关的黏弹性采用三元件模型模拟,模型参数通过热机械动力学分析实验测定,基于黏弹性–弹性对应性原理,采用复刚度法建立了单向和层合复合材料不同温度条件下的储能模量和耗散模量预测模型,并制备了一种玻璃纤维增强复合材料进行了试验验证。研究发现单向复合材料0°方向的耗散模量及90°方向的储能模量在整个实验温度范围内与树脂基体的变化规律是一致的,层合板的耗散抗弯刚度随温度近似呈线性增加,而储能抗弯刚度则呈加速下降趋势。所建立的模型能反映出试验观测到的规律。 展开更多
关键词 纤维增强复合材料 弹性行为 储能模量 损耗模量 复刚度
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具有自发可逆形变特性的液晶弹性体 被引量:2
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作者 秦瑞丰 朱光明 王金花 《材料科学与工艺》 EI CAS CSCD 北大核心 2006年第5期514-518,共5页
单畴结构的液晶弹性体具有自发可逆形变特性,是一种新型的智能材料,在传感器、微执行器等领域具有重要的应用价值.分别综述了热致型、光致型自发可逆形变液晶弹性体的研究发展现状,分析和阐述了单畴液晶弹性体自发可逆形变特性的原理,... 单畴结构的液晶弹性体具有自发可逆形变特性,是一种新型的智能材料,在传感器、微执行器等领域具有重要的应用价值.分别综述了热致型、光致型自发可逆形变液晶弹性体的研究发展现状,分析和阐述了单畴液晶弹性体自发可逆形变特性的原理,并展望了单畴液晶弹性体在人工肌肉和形状记忆材料方面的应用前景. 展开更多
关键词 单畴液晶弹性 向列-各向同性转变 热弹性行为 光力学效应 人工肌肉
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Henriksen and Flora (1999) Revisited A Literature Review on Third-Person Effects and Children/Adolescents*
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作者 Gabriella Sandstig 《Journal of Literature and Art Studies》 2013年第7期436-450,共15页
In this literature review on TPE (third-person effects) and the behavioral consequences on children, the research questions posed are how the body of knowledge has evolved since the first empirical evidence of TPE a... In this literature review on TPE (third-person effects) and the behavioral consequences on children, the research questions posed are how the body of knowledge has evolved since the first empirical evidence of TPE among children and what knowledge gaps that remain. The traceable developments are two: (1) Compared to the vast amount of articles on TPE in general, the 5 9 identified on the topic of children are few and two thirds actually focus on adolescents/young adults rather than children. The reason put forward for studying younger children is the urge to prevent risky behavior through media literacy programs or pro-social advertisements; and (2) The studies have not primarily addressed results to support occurrence of TPE among children. Rather they support parental TPE or among the adolescents that TPE and reverse TPE occur due to certain kind of media content. The discussion on knowledge gaps that remain follow three themes: (1) Differentiations between self and others are in psychological studies implied to occur among children between the ages of 3-4 years old, yet no study address how children develop TPE; (2) There is a tendency to follow the more general development within TPE research with the renewed interest in behavioral consequences. But the primary behavioral consequence studied in TPE in general and within studies of TPE and children is support for censorship. Few studies address "real" behavioral consequences like parental mediation; and (3) There is also a need for more theoretically coherent research on the importance of social distance. 展开更多
关键词 third-person perception TPE (third-person effects) hypothesis TPE (third-person effects) CHILDREN social distance corollary
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Thermoelastohydrodynamic behaviour of inclined-ellipse dimpled gas face seals 被引量:1
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作者 DING ShaoPeng BAI ShaoXian 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第4期529-537,共9页
The thermoelastohydrodynamic performance of an inclined-ellipse dimpled gas face seal is analyzed. The pressure distributions of the gas film and temperature fields of the seal rings and gas film are presented conside... The thermoelastohydrodynamic performance of an inclined-ellipse dimpled gas face seal is analyzed. The pressure distributions of the gas film and temperature fields of the seal rings and gas film are presented considering thermal and elastic distortions.Then, the influences of texturing parameters, including dimple inclination angle and dimple depth, on sealing performance are investigated under different operating parameters such as rotational speeds and seal pressures. The results show that face distortions lead to a decrease in the hydrodynamic effect at high rotational speed. The analysis shows that the opening force can decrease by more than 50% as the rotational speed increases from 0 to 35000 r min^(-1). The influence of face distortion on the seal performance, such as opening force and leakage characteristic, gradually increases with the rotational speed. 展开更多
关键词 thermoelastohydrodynamic effect elastic and thermal distortions inclined-ellipse dimple seal performance
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