Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fractographic study of welded joints of carbon fiber/PPS composites tested in lap shear

Full text
Author(s):
Miranda Barbosa, Lorena Cristina [1] ; Brejao de Souza, Samia Danuta [2] ; Botelho, Edson Cocchieri [2] ; Candido, Geraldo Mauricio [1] ; Rezende, Mirabel Cerqueira [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Paulo, Inst Ciencia & Tecnol, Sao Jose Dos Campos, SP - Brazil
[2] Univ Estadual Paulista, Fac Engn Guaratingueta, Guaratingueta, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ENGINEERING FAILURE ANALYSIS; v. 93, p. 172-182, NOV 2018.
Web of Science Citations: 6
Abstract

This work shows a fractographic study on fracture surfaces of welded joints by electrical resistance of thermoplastic composites based on polyphenylene sulfide (PPS) reinforced with continuous carbon fiber (CF), evaluated after lap shear loading. The fracture surfaces were generated with the complete breakdown of the specimens under the same conditions used in the mechanical test. The fractographic aspects of fracture surfaces were analyzed by scanning electron microscopy (SEM). SEM analyzes allowed evaluating the interfacial adhesion of fiber/matrix and matrix/heating element (a stainless steel mesh). All laminates showed a well-consolidated composite fracture surfaces, exhibiting cusps, river lines aspects and fibers recovered by a thin layer of polymeric matrix. This latter aspect indicates a strong fiber/matrix interfacial adhesion associated to the presence of voids. Moreover, the matrix/heating element interfacial adhesion was effective only in the laminates with higher lap shear strength values. In these cases, a good adhesion of the matrix was observed in the heating element. The highest strength values determined are attributed to the interdiffusion mechanism of the polymeric chains in the welded region of joints and also to the mechanical anchoring of polymer on the heating element surface. It was also observed the presence of matrix regions with globular aspects indicating unexpected effort in mode I during the lap shear strength test. (AU)

FAPESP's process: 13/13214-9 - STUDY OF WELDING PROCESS FOR THE INTEGRATION COMPOSITE PEEK / CARBON FIBER WITH FOR AERONAUTICAL APPLICATIONS
Grantee:Samia Danuta Brejão de Souza
Support type: Scholarships in Brazil - Doctorate