排序方式: 共有57条查询结果,搜索用时 15 毫秒
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为了研究铜膜/有机玻璃结构的界面性能,首先对沉积在有机玻璃基底上300nm厚的铜膜进行了单轴压缩实验,部分区域的薄膜因屈曲而脱离基底。选择在膜/基粘接良好区域、膜/基脱粘区域分别进行等位移纳米压痕实验。利用膜/基粘接良好区域处硬度/弹性模量与压痕位移的关系来确定膜/基结构的临界脱粘位移。基于宏观力学中表征界面性能的能量法,利用两个区域等位移的塑性功差值来确定界面能量释放率。研究结果表明:当压痕位移约450nm时,膜/基结构开始出现界面脱粘,实验测得铜膜/有机玻璃结构的界面能量释放率值在6.81~10.32J/m2之间。 相似文献
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1会议概况 国际实验力学学术会议(SEM)是国际实验力学领域规模最大、涵盖领域最广、人数最多的国际性学术会议.该会议由国际实验力学学会主办,每4年举行一次.今年是第九届,于2000年6月5日~8日在美国的佛罗里达的奥兰多 Florida Orlando举行.参会人数300多人,来自15个国家,与会论文250多篇.我国留美学者和学生参会人数较多,我国学者参会人数为2人. 为了达到促进力学学科与工程学科和新兴学科的结合,促进力学学科的工程应用以及力学领域内的理论与实验相结合,本次实验力学会议同时还有两个… 相似文献
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异质双材料粘接梁的界面端部应力及端部龟裂破坏的实验应力分析 总被引:1,自引:0,他引:1
本文采用了高灵敏度的云纹干涉法对异质双材料粘接梁在弯曲载荷作用下的位移进行了测量,用局部杂交法对界面端部区域的应变和应力进行了计算。通过对该区域内的实验应力分析发现:拉应力σx是影响结构强度的关键因素。本文还对在基体材料表面近角点区域可能出现的龟裂破坏的原因进行了分析。 相似文献
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数字光弹性法综述 总被引:8,自引:3,他引:8
将光弹性法与计算机图像处理技术相结合 ,来自动采集光弹性数据和分析应力的方法 ,称为数字光弹性法 ,与传统光弹性法相比 ,它可以进一步提高实验速度和精度。本文详细讨论了以下两个方面 :一是光弹性条纹的细化和倍增处理技术 ;二是自动确定光弹性参数的技术 ,包括相移法、傅立叶变换法、逐步载荷法、广谱分析法和RGB光弹性法等。通过对近二十年来国内外在这些方面的研究、应用和进展作了综述 ,认为采用白光的彩色域相移技术计算光弹性等倾角 ,结合采用白光源或三色光源的相移法来确定光弹性等色线级数 ,有望成为解决静态二维和三维冻结模型薄切片应力分析的最佳方法 ;另外 ,设计一种能实时和同步采集多幅条纹图的实验装置 ,通过相移法来自动获取动态光弹性数据 ,是数字动态光弹性法很有前景的发展方向 相似文献
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Experimental investigation of electrode cycle performance and electrochemical kinetic performance under stress loading 下载免费PDF全文
Lithium-ion batteries suffer from mechano–electrochemical coupling problems that directly determine the battery life. In this paper, we investigate the electrode electrochemical performance under stress conditions, where seven tensile/compressive stresses are designed and loaded on electrodes, thereby decoupling mechanics and electrochemistry through incremental stress loads. Four types of multi-group electrochemical tests under tensile/compressive stress loading and normal package loading are performed to quantitatively characterize the effects of tensile stress and compressive stress on cycle performance and the kinetic performance of a silicon composite electrode. Experiments show that a tensile stress improves the electrochemical performance of a silicon composite electrode, exhibiting increased specific capacity and capacity retention rate, reduced energy dissipation rate and impedances, enhanced reactivity, accelerated ion/electron migration and diffusion, and reduced polarization. Contrarily, a compressive stress has the opposite effect, inhibiting the electrochemical performance. The stress effect is nonlinear, and a more obvious suppression via compressive stress is observed than an enhancement via tensile stress. For example, a tensile stress of 675 k Pa increases diffusion coefficient by 32.5%, while a compressive stress reduces it by 35%. Based on the experimental results, the stress regulation mechanism is analyzed. Tensile stress loads increase the pores of the electrode material microstructure, providing more deformation spaces and ion/electron transport channels. This relieves contact compressive stress, strengthens diffusion/reaction, and reduces the degree of damage and energy dissipation. Thus, the essence of stress enhancement is that it improves and optimizes diffusion, reaction and stress in the microstructure of electrode material as well as their interactions via physical morphology. 相似文献
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Residual Stress on Surface and Cross-section of Porous Silicon Studied by Micro-Raman Spectroscopy 下载免费PDF全文
Surface and cross-sectional residual stresses of electrochemical etching porous silicon are investigated quantitatively by micro-Raman spectroscopy. The results reveal that a larger tensile residual stress exists on the surface and increase linearly with the porosity. On the other hand, across the depth direction perpendicular to the surface, the tensile residual stress decreases gradually from the surface to regions near the interface between the porous silicon layer and the Si substrate. However, a compressive stress appears at the interface near to the Si substrate for balancing with the tensile stress in the porous silicon layer. The cross-sectional residual stress profile is due to the porosity and lattice mismatch gradients existing in the cross-section and influencing each other.Furthermore, the presented residual stresses of the porous silicon have a close relation with its microstructure. 相似文献
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