If the strength ratio is greater than one, what will the lamina be considered as?
(A) Failed
(B) Safe
(C) May fail
When is the failure in a material, according to the Tsai-Hill theory, assumed to occur?
(A) When the distortion energy is less than
the failure distortion energy of the
material
(B) When the distortion energy is half the
failure distortion energy of the material
(C) When the distortion energy is greater
than the failure distortion energy of the
material
Which failure theories does the concept of strength ratio apply to (check all that apply)?
(A) Tsai-Wu failure theory
(B) Maximum strain failure theory
(C) Tsai-Hill failure theory
(D) Maximum stress failure theory
The maximum stress and maximum strain failure theories give same or different results for strength ratio. Which of the following is true (check all that apply).
(A) Different results for every case
(B) Same results if the major Poisson’s ratio
is zero
(C) Same results if the mode of failure is in
shear in both failure theories.
(D) Same results for every case
Which failure theory is based on the total strain energy failure theory of Beltrami?
(A) Tsai-Hill failure theory
(B) Maximum stress failure theory
(C) Tsai-Wu failure theory
(D) Maximum strain failure theory
To apply the Tsai-Hill failure theory, you need to use
(A) global stresses
(B) local strains
(C) local stresses
(D) global strains
The Tsai-Hill failure theory is a
(A) Separated theory
(B) Divided theory
(C) Unified theory
Strength ratio is defined as
(A) load which can be applied before failure
divided by the longitudinal Young’s
modulus.
(B) load which can be applied before failure.
(C) load which can be applied before failure
divided by the load applied.
The Tsai-Wu failure theory gives a more accurate prediction of failure criterion because
(A) it accounts for all the stresses and
strengths.
(B) it only uses tensile and shear strength
properties
(C) it does not predict the mode of failure.