Mechanical performance of composite bonded joints in the presence of localised process-induced zero-thickness defects

The objective of this study is to investigate the surface roughness that effect the capability of adhesive with adding aluminium powder and 63/37 Sn-Pb soft solder powder to the epoxy to increase the mechanical strength of joints. The adhesive strength of the joints was determined by utilizing the single-lap shear test. As seen from the experiments, the surface roughness has an important effect on the strength of adhesive bonded joints. Experimental results show that joints prepared by adhesive which was modified, adding in the amount of 5 wt% 63/37 Sn-Pb powder have more mechanical strength than joints compared to one which is prepared by adding aluminium powder with different ratios as 5, 25,50 wt%.

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Mechanical Performance Analysis of Composite Scarf Joints with Debond Flaw

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1016.95 ◽

2014 ◽

Vol 1016 ◽

pp. 95-99 ◽

Cited By ~ 1

Author(s):

Xia Guo ◽

Zeng Shan Li ◽

Wen Chao Zhang ◽

Ri Ming Tan ◽

Zhi Dong Guan

Keyword(s):

Failure Mode ◽

Mechanical Performance ◽

Load Carrying Capacity ◽

Bonded Joints ◽

The Finite Element Method ◽

Adhesively Bonded ◽

Adhesively Bonded Joints ◽

Load Carrying ◽

Scarf Joints ◽

Bond Region

The adhesive structural mechanical performance is influenced by debond flaw. This paper presents a research on the effect of flaws on the mechanical performance of composite scarf joints. The experimental results show that the load-carrying capacity of composite scarf joints changed along with the location of the debond flaw. The location of the flaw in the bondline influences the failure mode. Additionally, the finite element method was employed to obtain the failure mode of the composite scarf joint. The adhesively bonded joints were modeled using ABAQUS software. The computational results show that flaws located at the edge of the bond region result in more pronounced load reduction than which located at the middle of bond region.

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Nondestructive Evaluation of Adhesively Bonded Joints in Graphite/Epoxy Composites Using Acousto-Ultrasonics

Journal of Pressure Vessel Technology ◽

10.1115/1.2929050 ◽

1992 ◽

Vol 114 (3) ◽

pp. 344-352 ◽

Cited By ~ 5

Author(s):

S. Tanary ◽

Y. M. Haddad ◽

A. Fahr ◽

S. Lee

Keyword(s):

Mechanical Performance ◽

Bonded Joints ◽

Propagation Characteristics ◽

Lap Joint ◽

Adhesively Bonded ◽

Shear Tests ◽

Adhesively Bonded Joints ◽

Testing Conditions ◽

Single Lap Joint ◽

Film Adhesive

This paper is concerned with the use of the acousto-ultrasonic technique to evaluate nondestructively the mechanical performance of composite bonded joints. In this context, acousto-ultrasonic measurements followed by destructive shear tests were performed on single lap joint specimens made from graphite/epoxy adherends joined with FM 300 film adhesive. The results indicate a good correlation between acousto-ultransonic wave propagation characteristics and the shear strength of the bonded joints under different testing conditions. These correlations suggest that an estimation of the joint strength can be made by using acousto-ultrasonics provided that the measurement system is calibrated for variations of the material and geometry of the specimen.

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