由中国电子学会印制电路专业委员会主办,东莞生益敷铜板股份有限公司承办的《’94多层印制板技术研讨会》于7月6日至8日在东莞召开。这是迄今为止国内首次有关多层印制板(MLB)技术的专题研讨会。会上宣讲的6篇论文及香港MICA—AVA(FE) I...由中国电子学会印制电路专业委员会主办,东莞生益敷铜板股份有限公司承办的《’94多层印制板技术研讨会》于7月6日至8日在东莞召开。这是迄今为止国内首次有关多层印制板(MLB)技术的专题研讨会。会上宣讲的6篇论文及香港MICA—AVA(FE) IND LTD的C、B、KATZKO先生强会上所作“当今世界线路板市场及技术动向”,内容丰富,既有理论也有实践,也括了当前多层板生产工艺、材料及量产管理方面以及多层板国内外市场状况及今后的发展。现根据有关多层板方面内容,作以下总结。展开更多
A new test method was proposed to evaluate the cohesive strength of composite laminates. Cohesive strength and the critical strain energy for Mode-II interlamiar fracture of E-glass/epoxy woven fabrication were determ...A new test method was proposed to evaluate the cohesive strength of composite laminates. Cohesive strength and the critical strain energy for Mode-II interlamiar fracture of E-glass/epoxy woven fabrication were determined from the single lap joint(SLJ) and end notch flexure(ENF) test, respectively. In order to verify their adequacy, a cohesive zone model simulation based on interface finite elements was performed. A closed form solution for determination of the penalty stiffness parameter was proposed. Modified form of Park-Paulino-Roesler traction-separation law was provided and conducted altogether with trapezoidal and bilinear mixed-mode damage models to simulate damage using Abaqus cohesive elements. It was observed that accurate damage prediction and numerical convergence were obtained using the proposed penalty stiffness. Comparison between three damage models reveals that good simulation of fracture process zone and delamination prediction were obtained using the modified PPR model as damage model. Cohesive zone length as a material property was determined. To ensure the sufficient dissipation of energy, it was recommended that at least 4 elements should span cohesive zone length.展开更多
文摘由中国电子学会印制电路专业委员会主办,东莞生益敷铜板股份有限公司承办的《’94多层印制板技术研讨会》于7月6日至8日在东莞召开。这是迄今为止国内首次有关多层印制板(MLB)技术的专题研讨会。会上宣讲的6篇论文及香港MICA—AVA(FE) IND LTD的C、B、KATZKO先生强会上所作“当今世界线路板市场及技术动向”,内容丰富,既有理论也有实践,也括了当前多层板生产工艺、材料及量产管理方面以及多层板国内外市场状况及今后的发展。现根据有关多层板方面内容,作以下总结。
文摘A new test method was proposed to evaluate the cohesive strength of composite laminates. Cohesive strength and the critical strain energy for Mode-II interlamiar fracture of E-glass/epoxy woven fabrication were determined from the single lap joint(SLJ) and end notch flexure(ENF) test, respectively. In order to verify their adequacy, a cohesive zone model simulation based on interface finite elements was performed. A closed form solution for determination of the penalty stiffness parameter was proposed. Modified form of Park-Paulino-Roesler traction-separation law was provided and conducted altogether with trapezoidal and bilinear mixed-mode damage models to simulate damage using Abaqus cohesive elements. It was observed that accurate damage prediction and numerical convergence were obtained using the proposed penalty stiffness. Comparison between three damage models reveals that good simulation of fracture process zone and delamination prediction were obtained using the modified PPR model as damage model. Cohesive zone length as a material property was determined. To ensure the sufficient dissipation of energy, it was recommended that at least 4 elements should span cohesive zone length.
