Mechanical Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 30)
30.
In compression test, the fracture in cast iron specimen would occur along
Discussion:
27 comments Page 1 of 3.
Hasid said:
5 years ago
Cast iron is very strong in compression but weak in shear. When a cast iron specimen is subjected to a compression test, the perpendicular cross-section bears the direct compressive stress. But a plane inclined at 45 degree to the normal plane has shear stresses due to resolved compression force.
Thus this plane is subjected to shear stress. As said earlier, cast iron is weak in shear. So failure occurs along this inclined or oblique plane.
Thus this plane is subjected to shear stress. As said earlier, cast iron is weak in shear. So failure occurs along this inclined or oblique plane.
(1)
Akshay said:
10 years ago
As cast iron is brittle material, it will fail by max normal stress, Mohr's circle for for pure compression shows that principle plane on which max normal stress is acting making zero angle i.e. plane should be at right angle to axis of force, I think answer should be 'C'.
Rajkumar thakur said:
8 years ago
In compression, brittle failure plane will be oblique since failure due shear, and in case tension test brittle material failure plane will be right angle to the axis.
Sozharajan said:
8 years ago
Plane in any direction except 90 and 0 degree is called oblique plane example we find the stress at 32-degree in the plane, then the stress is called oblique stress.
Dwaipayan said:
6 years ago
A brittle material will always fail along tge plane which is normal to the stress axis for uniaxial tension as it follows the maximum normal stress condition.
Prakash said:
10 years ago
Answer will be 'C' as in case of brittle material failure occurs only due to normal stress which act about a cross section perpendicular to the axis.
Saurabh sharma said:
6 years ago
In case of brittle material, the failure due to compression will be shear crack failure at 45degree which is an oblique plane so the answer is B.
Ethin said:
6 years ago
For tensile test it will in the right angle plane but for compression it fail in oblique plane normally 45deg.
Chandra prakash said:
8 years ago
Every brittle material is in compression test fail at the oblique plan, but not at an angle of 45 degrees.
Sachin said:
1 decade ago
As brittle material always fail along a plane neither along or at right angle to the axis of specimen.
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