Characteristics of resistance welding of lap-shear coupons. Part III. Crystallinity

被引：26

作者：

Ageorges, C

Ye, L ^{[1
]}

Mai, YW

Hou, M

机构：

[1] Univ Sydney, Dept Mech & Mechatron Engn, Ctr Adv Mat Technol, Sydney, NSW 2006, Australia

[2] Cooperat Res Ctr Aerosp Struct Ltd, Bankstown, NSW 2200, Australia

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 1998年 / 29卷 / 08期

基金：

澳大利亚研究理事会;

关键词：

resistance welding; crystallisation kinetics; crystal-melting kinetics; thermoplastic-matrix composites; PEEK;

D O I：

10.1016/S1359-835X(98)00024-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A transient three-dimensional heat-transfer, consolidation and crystallinity model for the resistance welding of thermoplastic-matrix composite lap-shear specimens is established. The heat-transfer model assumes orthotropic heat conduction in the composite parts and includes heat losses by radiation as well as natural convection. For the APC-2 laminate/PEEK film welding configuration, three crystallisation kinetics models are compared during the cooling stage of the resistance welding process. Cooling rates are predicted for natural cooling and the total processing time is determined. A coupled crystallisation kinetics/crystal-melting model is developed to predict the final crystallinity level in the welded joint. The effect of power level on the final crystallinity in the joint is investigated. Latent heat due to crystallisation and crystal-melting events is predicted and taken into account in the heat-transfer model. The influence of the environmental temperature on cooling rates and on the final crystallinity level in the joint is discussed. For the CF-PP laminate/PP film welding configuration, final crystallinity levels are predicted and compared with experimental data. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：921 / 932

页数：12

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