Answer the following questions about the Ductile-to-Brittle Transition Temperature (DBTT). Explain the three main factors in the change in properties of a material from ductile to brittle.

Write the constitutive law for a material with linear elastic anisotropic behavior under mechanical loading

What is the cause of the fracture of a brittle material?

Based on the stress-strain plots, which materials tested are stiff and which are tough? How can you tell the difference? * we tested (Steel HR250)and (Aluminium 5251)in this experiment

Estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation of an elliptically shaped surface cra of length 0.5 mm and having a tip radius of curvature of 0.005 mm, when a stress of 1040MPa is applied. Your answer must be in GPa. Write your answer to 1 decimal place. Answer: V 30 (0) 00 a W 4340 steel alloy. Determine the ductile to brittle transition

Give some examples of brittle materials?

o (MPa) 900 800 700 600 500 400 300 200 100 0 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 Question 1 Which ONE of the following descriptions is TRUE for this material? Its yield stress is approximately 720 MPa. It is a brittle material. It is a ductile material. Its ductility as a percentage elongation is approximately 0.6%. E

The sketch below shows a material with a crack of length 2a, and a nominal stress of s0. You are informed that the stress at the tip is 8 s0. The fracture stress of the material is 12 s0. 1) what is the radius of curvature of the crack tip? 2) if the radius of curvature is reduced further by a factor of 2, will the local tip stress now exceed the fracture stress?

A tensile test for a copper specimen has been performed and the following data are obtained.  - Percentage of Elongation = 60 % - Percentage of Reduction in Area = 36 % - Final length after fracture = 35.2 mm - Final Diameter after fracture = 3.54 mm &  - Ultimate stress = 439 MPa    i) Initial Length (in mm) =  ii) Final Area (in mm2) =  iii) Initial Area (in mm2) =

this is material science question