tailieunhanh - Fundamentals of Machine Design P8

In developing a machine it is impossible to avoid changes in cross-section, holes, notches, shoulders etc. Some examples are shown in figure | Module 3 Design for Strength Version 2 ME IIT Kharagpur Lesson 2 Stress Concentration Version 2 ME IIT Kharagpur Instructional Objectives At the end of this lesson the students should be able to understand Stress concentration and the factors responsible. Determination of stress concentration factor experimental and theoretical methods. Fatigue strength reduction factor and notch sensitivity factor. Methods of reducing stress concentration. Introduction In developing a machine it is impossible to avoid changes in cross-section holes notches shoulders etc. Some examples are shown in figure- . Some typical illustrations leading to stress concentration. Any such discontinuity in a member affects the stress distribution in the neighbourhood and the discontinuity acts as a stress raiser. Consider a plate with a centrally located hole and the plate is subjected to uniform tensile load at the ends. Stress distribution at a section A-A passing through the hole and another Version 2 ME IIT .

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