Material for tube section
In order for the tube to effectively perform its functions, it must meet the following
requirements:
 Very good properties of welding
 Higher durability and torsional strength
 High accuracy in terms of geometry. This extends to roundness and eccentricity
 Excellent condition of the surface
 High values of strength (Gong et al.2018).
In order for the above requirements to be met, a tough material preferably Aluminium Alloy is
chosen. This is because it is known to exhibit good weldability, light weight and well s resistance
to corrosion.
Stress transformation and rupture
Through transformation effects, stress rupture will take place at the end of tertiary creep stage.
This implies that through transformation of stress, the tube’s load carrying capacity will drop to
the level of applied stress hence leading to the failure. The torsional stress transformation will
therefore cause fracture to occur diagonally (Wotzak 2017).
Calculations
Parameters given;
 A torque of 1100 N.m
 Diameter of 42 mm
 The material used yield stress of is 450 MPa.

Engineering Mechanics | Report

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