scholarly journals Carbon fiber non-crimp multi-axial reinforcement and epoxy mono-component system composite: Fatigue behavior

2010 ◽  
Vol 2 (1) ◽  
pp. 341-348 ◽  
Author(s):  
M.O.H. Cioffi ◽  
G. Volpiano ◽  
H.J.C. Voorwald ◽  
M.C. Rezende
Keyword(s):  
Carbon Fiber ◽  
Fatigue Behavior ◽  
Component System ◽  
Axial Reinforcement

STUDY ON FATIGUE BEHAVIOR OF STRENGTHENED NON-LOAD-CARRYING CRUCIFORM WELDED JOINTS USING CARBON FIBER SHEETS

2012 ◽  
Vol 12 (01) ◽  
pp. 179-194 ◽  
Author(s):  
TAO CHEN ◽  
QIAN-QIAN YU ◽  
XIANG-LIN GU ◽  
XIAO-LING ZHAO
Keyword(s):  
Stress Concentration ◽  
Carbon Fiber ◽  
Welded Joints ◽  
Failure Modes ◽  
Fatigue Behavior ◽  
Local Stress ◽  
Fatigue Loading ◽  
Cfrp Sheets ◽  
Load Carrying ◽  
Weld Toe

This paper reports an experimental study on the use of carbon fiber-reinforced polymer (CFRP) sheets to strengthen non-load-carrying cruciform welded joints subjected to fatigue loading. Failure modes and corresponding fatigue lives were recorded during tests. Scatter of test results was observed. Thereafter, a series of numerical analyses were performed to study the effects of weld toe radius, the number of CFRP layers and Young's modulus of reinforced materials on local stress concentration at a weld toe. It was found that fatigue life of such welded connections can be enhanced because of the reduction of stress concentration caused by CFRP strengthening. Parametric study indicates that the weld toe radius and the amount of CFRP are the key parameters influencing the stress concentration factors and stress ranges of the joint. Enhancement of modulus for adhesive and CFRP sheets can also be beneficial to the fatigue performance to some extent.

Interfacial properties and fatigue behavior of carbon fiber epoxy laminate composites

2013 ◽  
Vol 33 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Hsien-Tang Chiu ◽  
Yung-Lung Liu ◽  
Kuo-Chuan Liang ◽  
Peir-An Tsai
Keyword(s):  
Fatigue Life ◽  
Carbon Fiber ◽  
Fatigue Fracture ◽  
Stress Level ◽  
Fatigue Behavior ◽  
Cyclic Stress ◽  
Matrix Cracking ◽  
Stacking Sequence ◽  
Carbon Fiber Laminate ◽  
Carbon Fiber Epoxy

Abstract The study elucidated the relationship between the stacking sequence and physical properties, by investigating mechanical properties, fatigue life and the morphology, after fatigue fracture of carbon fiber/epoxy composites. The results show that the unidirectional carbon fiber laminate has the maximum tensile stress. Moreover, the laminate with ±45° plies can improve the tensile strain. The fatigue life of all specimens was shorter than 103 cycles under high cyclic stress level, and longer than 106 cycles under low cyclic stress level. Laminates with [908]s stacking sequence had the shortest fatigue life under high and low cyclic stress, while the unidirectional carbon fiber laminate had the highest fatigue life. A number of fatigue damage models, including delaminating, matrix cracking and fiber failure, have been identified by scanning electron microscopy (SEM). The SEM micrographs showed that the morphology on the cross section, after fatigue fracture, was significantly correlated to the stacking sequence.

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