Design a muff coupling to connect two shafts

Design for machine elements

1. DEPARTMENT OF MECHANICAL ENGINEERING SELF LEARNING COURSE CODE : ME3591 COURSE NAME :DESGIN OF MACHINE ELEMENTS Topic: Advanced Theory and Applications of Bonded Joints in Modern Engineering . Date :25/09/2025 Register No. Name 721223114027 MEI YA RASAN M 721223114037 PRAVEENKUMAR S 721223114040 RAJAN K 721223114302 LINGESH V Team Members

2. INTRODUCTION Define bonded joints and contrast them with welded or mechanical fastening methods. Highlight key advantages, such as weight reduction , even load distribution , and enhanced fatigue performance . Briefly mention challenges like environmental sensitivity and inspection complexity.

3. TYPES OF BONDED JOIT Bonded Joint Types & Geometries Present the most common joint configurations: single-lap (SLJ) , double-lap (DLJ) , stepped-lap , and scarf joints. Use the opening visual to illustrate differences in geometry and associated stress profiles.

4. Single-Lap Joint (SLJ) Two adherends overlap slightly and are bonded over the overlapping area. Common and simple, but susceptible to peel stresses at the edges.

5. Double-Lap Joint (DLJ) A central adherend is sandwiched between two others in symmetric overlaps, reducing peel stress and improving strength.

6. Stepped-Lap Joint Overlapping surfaces are stepped or terraced, which improves stress distribution and avoids edge peeling.

7. Working Principle of Bonded Joints Based on adhesive bonding between two surfaces. Adhesion : adhesive molecules bond with the substrate surface. Cohesion : internal strength of adhesive resists failure. Load is transferred through the adhesive layer from one material to another. Works effectively in shear and compression stresses . Stress distributed uniformly over large bonding area. Reduces stress concentration compared to mechanical joints. Provides sealing, insulation, and corrosion resistance along with joining.

8. Fundamentals of Stress Distribution & Load Transfer Discuss how shear and peel stresses develop in bonded joints, especially at overlap edges. Cover design strategies to mitigate stress concentrations (e.g., tapered adherends, symmetric design, appropriate bondline thickness)

9. Modelling & Analytical Methods Introduce the use of analytical models and simplified design procedures (e.g., NASA’s method for composites). Emphasize advanced numerical approaches: Cohesive Zone Modeling (CZM) and Finite Element Modeling (FEM) for predicting joint behavior .

10. Advantages No need for drilling holes → avoids stress concentrations. Can join dissimilar materials (metal to plastic, composites to wood, etc.). Uniform stress distribution over a large area. Lightweight joints compared to mechanical fasteners. Seals against moisture, air, and corrosion.

11. Disadvantages Lower strength in peel or impact loading. Joint strength depends on surface preparation and curing. Limited temperature and environmental resistance (depending on adhesive). Difficult to disassemble for repair.

12. APPLICATION Aerospace : Lightweight composite bonding (fuselage, wings), engine components, satellite assemblies. Automotive : Panel and interior bonding, structural integrity, noise dampening. Renewables : Rotor blade assembly in wind turbines via automated adhesive systems. Electronics : Optical bonding of displays, component encapsulation, thermal management.

13. THANK YOU