Characteristics and formation mechanism of porosities in CFRP during laser joining of CFRP and steel

被引：161

作者：

Tan, Xianghu ^{[1
]}

Zhang, Jing ^{[2
]}

Shan, Jiguo ^{[1
,3
]}

Yang, Shanglu ^{[2
]}

Ren, Jialie ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China

[2] Gen Motors China Investment Co Ltd, China Sci Lab, Shanghai 201206, Peoples R China

[3] Tsinghua Univ, Key Lab Adv Mat Professing Technol, Minist Educ, Beijing 100084, Peoples R China

来源：

COMPOSITES PART B-ENGINEERING | 2015年 / 70卷

基金：

中国国家自然科学基金;

关键词：

Polymer matrix composites (PMCs); Thermal properties; Porosity; Joints/joining; THERMOPLASTIC COMPOSITES; KINETIC-PARAMETERS; POLYMER; PRESSURE; STRENGTH; SHEETS; JOINTS;

D O I：

10.1016/j.compositesb.2014.10.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An experimental investigation on the mechanism of porosity formation during the laser joining of carbon fiber reinforced polymer (CFRP) and steel is presented. The porosity morphology and distribution were characterized by optical and scanning electron microscopy, and the thermal pyrolysis behaviors were investigated by thermal analysis and designed back-side cooling experiments. The results show that there are two types of porosities in CFRP. Porosity I only appears when the heat input is more than 77.8 J/mm. It has a smooth inner wall and distributes near the bonding interface between CFRP and steel at the central area of melted zone, which is caused by gaseous products such as CO2, NH3, H2O, and hydrocarbons produced by the pyrolysis of CFRP. Porosity II can be seen under all joining conditions. It has a rough inner wall and distributes far away from the bonding interface, concentrating at the final solidification locations. Porosity II is caused by the shrinkage of melted CFRP during solidification stage. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：35 / 43

页数：9

共 46 条

[1]

Abdel Wahab M. M., 2012, ISRN MAT SCI, V2012, P1

[2] On the feasibility of friction spot joining in magnesium/fiber-reinforced polymer composite hybrid structures [J].

Amancio-Filho, S. T. ;

Bueno, C. ;

dos Santos, J. F. ;

Huber, N. ;

Hage, E., Jr. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2011, 528 (10-11) :3841-3848

[3] Loading and fracture response of CFRP-to-steel adhesively bonded joints with thick adherents - Part I: Experiments [J].

Anyfantis, Konstantinos N. ;

Tsouvalis, Nicholas G. .

COMPOSITE STRUCTURES, 2013, 96 :850-857

[4] An experimental study on the long-term behavior of CFRP pultruded laminates suitable to concrete structures rehabilitation [J].

Ascione, F. ;

Berardi, V. P. ;

Feo, L. ;

Giordano, A. .

COMPOSITES PART B-ENGINEERING, 2008, 39 (7-8) :1147-1150

[5] Improvement of Ultrasonically Welded Aluminum/Carbon Fiber Reinforced Polymer-Joints by Surface Technology and High Resolution Analysis [J].

Balle, Frank ;

Emrich, Stefan ;

Wagner, Guntram ;

Eifler, Dietmar ;

Brodyanski, Alexander ;

Kopnarski, Michael .

ADVANCED ENGINEERING MATERIALS, 2013, 15 (09) :814-820

[6] Role of cooling pressure on interlaminar fracture properties of commingled CF/PEEK composites [J].

Beehag, A ;

Ye, L .

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 1996, 27 (03) :175-182

[7] Hybrid titanium-CFRP laminates for high-performance bolted joints [J].

Camanho, P. P. ;

Fink, A. ;

Obst, A. ;

Pimenta, S. .

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2009, 40 (12) :1826-1837

[8] KINETIC PARAMETERS FROM THERMOGRAVIMETRIC DATA .2. [J].

COATS, AW ;

REDFERN, JP .

JOURNAL OF POLYMER SCIENCE PART B-POLYMER LETTERS, 1965, 3 (11PB) :917-&

[9] KINETIC PARAMETERS FROM THERMOGRAVIMETRIC DATA [J].

COATS, AW ;

REDFERN, JP .

NATURE, 1964, 201 (491) :68-&

[10]

Compton R., 1975, Degradation of polymers

← 1 2 3 4 5 →