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Why does the brittle material fails in helicoidal shape and ductile material shears on right section under torsion load

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Answer:

Salamat sa points ate hehe

Answer:

Hence, brittle materials fails in tension. Hence brittle material subjected to torsion fails at 45° plane (Helicoidal failure). ... Hence ductile materials failure occurs due to principle shear stress. In torsion test maximum shear stress is in the direction perpendicular to longitudinal axis.