| 薛秀丽,王世斌*,李林安.力-热耦合作用下钛膜的破坏行为实验研究[J].实验力学,2014,29(6):689~694 |
| 力-热耦合作用下钛膜的破坏行为实验研究 |
| Experimental Study of Force-Thermal Coupling Effect on Titanium thin Films Fracture Behavior |
| 投稿时间：2014-04-14 修订日期：2014-06-15 |
| DOI：10.7520/1001-4888-14-071 |
| 中文关键词: 薄膜 屈曲 断裂 力-热耦合作用 |
| 英文关键词:thin film buckling fracture force-thermal coupling effect |
| 基金项目:国家973项目(2012CB937500)资助 |
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| 中文摘要: |
| 金属薄膜/聚合物基底(尤其是温度敏感型的聚合物)结构在外力和加热影响下的力学性能变化直接影响到器件的功能和使用寿命。通过光学显微镜原位观察钛膜/有机玻璃基底结构在力-热(20~44℃)耦合作用下的薄膜表、界面响应。在外部轴向压力作用下，薄膜会发生垂直于加载方向的屈曲。保持试件的加载端边界位移不变，对其进行加热，薄膜会出现垂直于屈曲方向的横向裂纹。通过分析发现薄膜产生横向裂纹的原因为：力-热耦合作用促使聚合物基底在非加载端方向的拉应变增大。在不同长度的薄膜裂纹段上，较长裂纹段中心部位上受到基底传递的拉应力较大，产生再次断裂的可能性较高。 |
| 英文摘要: |
| Mechanical property variation of metal film/polymer substrate structure (especially for temperature-sensitive polymer) due to external force action and heating will directly affect the function and service life of the device. The response of titanium/plexiglass substrate thin film surface and interface subjected to force-thermal (20-44℃) coupling action was in-situ observed by optical microscope. Under the external axial compression, film buckling perpendicular to the load direction occurs. Keeping constant of the loaded boundary displacement and heating specimen, film transverse cracking occurs perpendicular to the buckling direction. Analytical results show that the cause of film transverse cracking is the tensile strain increase of polymer substrate along non-loading direction due to force-thermal coupling action. For film crack segments with different lengths, the tensile stress transferred from the substrate at the central part of longer segment is larger than that of shorter one, resulting in rather high probability of second fracture occurance. |
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