Variation of Adhesive Strength in Single Lap Joint (SLJ) with Surface Irregularities

Aditya V. Natu^1, , Ankit R. Sharma^1, and Nitinkumar R. Anekar¹

¹Department of Mechanical Engineering, MIT-COE, Pune, India

Cite this paper:
Aditya V. Natu, Ankit R. Sharma and Nitinkumar R. Anekar. Variation of Adhesive Strength in Single Lap Joint (SLJ) with Surface Irregularities. American Journal of Mechanical Engineering. 2019; 7(2):61-67. doi: 10.12691/ajme-7-2-2

Abstract

Single Lap Joints are used extensively in the aerospace industry due to their lower weight and absence of stress concentration due to drilled holes. However, their lesser strength remains an important limitation. Different modes of failures have been reviewed in this article. The bond strength of a single lap joint can be varied by varying its overlap length, while, the strength does not strictly increase with increasing bonding length. Rather, it increases up to an optimum value and decreases further. This optimum value was obtained, which is found to be in agreement with previous studies in this regard. The surfaces of the bonded aluminum plates were modified by generating notch shaped pattern on bonding area. Due to notch pattern of bonding, the bond strength increases up to 75° notch angle and then decreases with further increase in the notch angle. The experimental results of bonded joints without notch also were obtained by software analysis. Maximum strength of joint length reached at optimum length and optimum notched surface pattern.

Keywords:
single- lap joint adhesive surface irregularities (Notch) epoxy resin aluminum bond strength FEA UTM Testing adhesive joint analysis bond strength

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