为研究消费电子行业超薄高强钢化盖板玻璃的动态和静态破裂应力,采用两组0.4 mm厚度玻璃式样,分别进行钢球冲击和环压环(ring on ring,ROR)实验,且均结合了数值仿真对比分析,实测和仿真的结果吻合度较高。得到了两组玻璃非边缘区域的动...为研究消费电子行业超薄高强钢化盖板玻璃的动态和静态破裂应力,采用两组0.4 mm厚度玻璃式样,分别进行钢球冲击和环压环(ring on ring,ROR)实验,且均结合了数值仿真对比分析,实测和仿真的结果吻合度较高。得到了两组玻璃非边缘区域的动态和静态破裂应力数据,二者的威布尔分布曲线形状参数β值相似度高,分别为13.95和13.64,前者的B50破裂应力是后者的1.65倍。利用最小二乘法,根据两组实验的破裂应力和应力速率拟合出了相关的破裂参数n值,为19.2,为实际工程仿真中玻璃动态破裂应力阈值的研究提供了实验和仿真模型参考。展开更多
The mechanical performance of exceedingly soft materials such as Ag is significantly influenced by various working conditions.Therefore,this study systematically investigates the effects of crack geometry,substrate cr...The mechanical performance of exceedingly soft materials such as Ag is significantly influenced by various working conditions.Therefore,this study systematically investigates the effects of crack geometry,substrate crystal orientation,and indenter shape on crack propagation.The mechanical response of Ag is analyzed using the quasi-continuum(QC)method.A pre-crack with a predefined depth and angle was introduced to initiate fracture behavior.The results show that when the pre-crack height is 50 A,the crack propagates rapidly as the imprint depth increases from0 to 7 A,grows steadily up to 15 A,and then accelerates sharply between 15 and 20 A.For other pre-crack heights,crack propagation occurs at a relatively faster rate.Substrates with[100],[010],and[001]crystal orientations promote crack extension,while the onset of plastic deformation(referred to as the yield point in this study)and the fracture strength both increase with increasing pre-crack height.The yield point,fracture strength,and stress intensity factors are highly sensitive to the pre-crack height.When the pre-crack angle is 90○,the fracture strength reaches its maximum of 0.2%higher than that of the uncracked sample-whereas at 0○,it reaches its minimum,still 53.8%higher than that of the uncracked sample.The sample model is conducted using AutoCAD software.The optimized quasicontinuum(QC)method is used to investigate the effects of different crack geometries,substrate crystal orientations,and indenter shapes on the crack extension of Ag material.Baskes and Dow(FBD)potential is borrowed to describe the interaction forces between Ag-Ag,Ni-Ag,and Ni-Ni.展开更多
文摘为研究消费电子行业超薄高强钢化盖板玻璃的动态和静态破裂应力,采用两组0.4 mm厚度玻璃式样,分别进行钢球冲击和环压环(ring on ring,ROR)实验,且均结合了数值仿真对比分析,实测和仿真的结果吻合度较高。得到了两组玻璃非边缘区域的动态和静态破裂应力数据,二者的威布尔分布曲线形状参数β值相似度高,分别为13.95和13.64,前者的B50破裂应力是后者的1.65倍。利用最小二乘法,根据两组实验的破裂应力和应力速率拟合出了相关的破裂参数n值,为19.2,为实际工程仿真中玻璃动态破裂应力阈值的研究提供了实验和仿真模型参考。
基金by the Industry–Academia Cooperation Project No.113A00262(Te-Hua Fang).URLs to the sponsor websites are available at:https://www.nstc.gov.tw.
文摘The mechanical performance of exceedingly soft materials such as Ag is significantly influenced by various working conditions.Therefore,this study systematically investigates the effects of crack geometry,substrate crystal orientation,and indenter shape on crack propagation.The mechanical response of Ag is analyzed using the quasi-continuum(QC)method.A pre-crack with a predefined depth and angle was introduced to initiate fracture behavior.The results show that when the pre-crack height is 50 A,the crack propagates rapidly as the imprint depth increases from0 to 7 A,grows steadily up to 15 A,and then accelerates sharply between 15 and 20 A.For other pre-crack heights,crack propagation occurs at a relatively faster rate.Substrates with[100],[010],and[001]crystal orientations promote crack extension,while the onset of plastic deformation(referred to as the yield point in this study)and the fracture strength both increase with increasing pre-crack height.The yield point,fracture strength,and stress intensity factors are highly sensitive to the pre-crack height.When the pre-crack angle is 90○,the fracture strength reaches its maximum of 0.2%higher than that of the uncracked sample-whereas at 0○,it reaches its minimum,still 53.8%higher than that of the uncracked sample.The sample model is conducted using AutoCAD software.The optimized quasicontinuum(QC)method is used to investigate the effects of different crack geometries,substrate crystal orientations,and indenter shapes on the crack extension of Ag material.Baskes and Dow(FBD)potential is borrowed to describe the interaction forces between Ag-Ag,Ni-Ag,and Ni-Ni.
