TAILIEUCHUNG - Fundamentals of Machine Design P31

If the load is not very large adhesive joints become very useful in joining metallic or non–metallic dissimilar materials. No special device is needed. But the disadvantage of this joint is that the joint gets weakened by moisture or heat and some adhesive needs meticulous surface preparation. In an adhesive joint, adhesive are applied between two plates known as adherend. | Module 10 Design of Permanent Joints Version 2 ME IIT Kharagpur Lesson 5 Design of Adhesive Joints Version 2 ME IIT Kharagpur Instructional Objectives After reading this lesson the students should learn Different types of adhesives Stress distribution in adhesive joints Design procedure of adhesive joints 1. Adhesive joints and their advantages If the load is not very large adhesive joints become very useful in joining metallic or non-metallic dissimilar materials. No special device is needed. But the disadvantage of this joint is that the joint gets weakened by moisture or heat and some adhesive needs meticulous surface preparation. In an adhesive joint adhesive are applied between two plates known as adherend. The strength of the bond between the adhesive and adherend arise become of various reasons given below. The adhesive materials may penetrate into the adherend material and locks the two bodies. Long polymeric chain from the adhesive diffuse into the adherend body to form a strong bond. Electrostatic force may cause bonding of two surfaces. The advantages of the adhesive joints are given below The mechanism of adhesion helps to reduce stress concentration found in bolted riveted and welded joints. Shock and impact characteristics of the joints are improved Dissimilar materials such as metals plastics wood ceramics can be joined. Adhesive joints allow sufficient mechanical compliance in parts subjected to thermal distortion. Version 2 ME IIT .

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