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Material D is tested with the geometry and loading condition as shown on the right, with...
8.13 An engineering member is to be made of an aluminum alloy. It is in the...
8.13 An engineering member is to be made of an aluminum alloy. It is in the shape of a plate loaded in tension that may have a crack in one edge, as shown in Fig. 8.12(c). The dimensions are width b = 40 mm and thickness t = 4.0 mm, and the crack may be as long as a = 8.0 mm. The member must resist a tension force of P = 7.5 kN. (a) For a safety factor of...
Question 6 1 pts When a material doesn't change its strain perpendicular to the loading condition,...
Question 6 1 pts When a material doesn't change its strain perpendicular to the loading condition, the material is said to exhibit: Fracture Toughness Plane Strain Plane Stress Crack Propagation Question 7 1 pts The sharper the fillet radius is on the geometry of the part, the the stress concentration factor will be and the the material will catastrophically fajl. lower, more likely higher, less likely higher, more likely lower, less likely Question 8 1 pts FCC metals experience a...
6 a) b) c) The most important parameter that is an indication of a material's resistance...
6 a)
b)
c)
The most important parameter that is an indication of a material's resistance to deflection (eg. in beams) arising from mechanical loads is O Tensile strength O %elongation O impact toughness O ductility Yield strength o Kic Endurance limit OE The yield strength of a steel used in construction is ~ 800 MPa. The endurance limit of this steel is ~ 0.2 800 MPa 40% O 400 MPa O 1600 MPa O 200 MPa 0.4 MPa 4...
SECTION A Q1. (a) The standards for testing the fracture toughness of materials define the shape...
SECTION A Q1. (a) The standards for testing the fracture toughness of materials define the shape and proportion of the specimens but not their size. Explain why this is and why it is necessary to use specimens of different sizes for these tests. [5 marks] (b) You are testing samples of steel with a yield stress of 1200 MPa. Initial results show that the fracture toughness is 120 MPavm. The specimens are 10 mm thick. Determine whether the specimens are...
A. If a material is tested in the linear part of the engineering stress-strain curve, what...
A. If a material is tested in the linear part of the engineering stress-strain curve, what is expected behavior? B. Define the two trigonometric parameters in the definition of critical resolved shear stress C. How can hardness be used in determining the tensile strength? D. If an alloy is produced with a fine grain size, will it have higher or lower strength an opposed to igcoarse grained counterpart? E. How can solid solutions enhance strength? ! F. What is the...
post only Group#7 Problem 5 (6 marks) For the beam and loading shown, a) Draw the...
post
only Group#7
Problem 5 (6 marks) For the beam and loading shown, a) Draw the shear and bending-moment diagrams. b) Determine the maximum absolute value of the shear and bending moment. c) Determine the minimum required depth h of the beam. Knowing that the material used has an ultimate normal and shear stresses, use the given factor of safety in each loading case in the following table. P A LLL Dimensions, material properties and load values are presented in...
PLEASE MAKE SURE THE ANSWERS MATCH THE ONES GIVEN BETWEEN PARENTHESES 1. Fluctuating loading. The cold-drawn...
PLEASE MAKE SURE THE ANSWERS MATCH THE ONES GIVEN BETWEEN
PARENTHESES
1. Fluctuating loading. The cold-drawn AISI 1040 steel bar (S590 MPa, S 490 MPa) shown in the figure is subjected to the following different cyclic loading conditions. Estimate the fatigue factor of safety based on achieving infinite life (use Modified Goodman method) and the yielding factor of safety. If infinite life is not predicted, estimate the number of cycles to failure. The fatigue strength modification factor f 0.87. For...
7 a) b) c) d) Fracture toughness Kic of a material is: an indication of the...
7 a)
b)
c)
d)
Fracture toughness Kic of a material is: an indication of the materials ability to provide obstacles for dislocation motion. maximum ductility in the material an indication of the resistance a material offers to brittle fracture an indication of the materials endurance limit O maximum area under the stress-strain curve If the Kıc for Al2O3 is about 5 MPa.m 1/2, the Kıc for an Al alloy will be < 5 MPa.m 1/2 True O False The...
Question 3 For the simply supported steel beam with cross section and loading shown (see Figure...
Question 3 For the simply supported steel beam with cross section and loading shown (see Figure 3a), knowing that uniformly distributed load w=60 kN/m, Young modulus E = 200 GPa, and yield stress Cyield=200 MPa (in both tension and compression). ул 15 mm w=60 kN/m ... 1 B A 15 mm + 300 mm IC - i 2.5m 1 1 15 mm 7.5m 1 150 mm Figure 3a (a) Check if: the beam is safe with respect to yielding (using...
(20%) Question 6. The elastic modulus, yield strength and ultimate strength of a certain material afe...
(20%) Question 6. The elastic modulus, yield strength and ultimate strength of a certain material afe 110 GPa 2400 MPa and 265 MPal respectively. If a cylindrical bar of this material 380 mm long is subjected to a uniaxial tension test and its length is increased by an amount áf O.50 mm under a tensile load ót 6660 N.At the same time its diameter decreased by0,28 mm Calculate; a) The initial diameter of the bar, (8%) d b) Under an...
8.13 An engineering member is to be made of an aluminum alloy. It is in the shape of a plate loaded in tension that may have a crack in one edge, as shown in Fig. 8.12(c). The dimensions are width b = 40 mm and thickness t = 4.0 mm, and the crack may be as long as a = 8.0 mm. The member must resist a tension force of P = 7.5 kN. (a) For a safety factor of...
Question 6 1 pts When a material doesn't change its strain perpendicular to the loading condition, the material is said to exhibit: Fracture Toughness Plane Strain Plane Stress Crack Propagation Question 7 1 pts The sharper the fillet radius is on the geometry of the part, the the stress concentration factor will be and the the material will catastrophically fajl. lower, more likely higher, less likely higher, more likely lower, less likely Question 8 1 pts FCC metals experience a...
6 a)
b)
c)
The most important parameter that is an indication of a material's resistance to deflection (eg. in beams) arising from mechanical loads is O Tensile strength O %elongation O impact toughness O ductility Yield strength o Kic Endurance limit OE The yield strength of a steel used in construction is ~ 800 MPa. The endurance limit of this steel is ~ 0.2 800 MPa 40% O 400 MPa O 1600 MPa O 200 MPa 0.4 MPa 4...
SECTION A Q1. (a) The standards for testing the fracture toughness of materials define the shape and proportion of the specimens but not their size. Explain why this is and why it is necessary to use specimens of different sizes for these tests. [5 marks] (b) You are testing samples of steel with a yield stress of 1200 MPa. Initial results show that the fracture toughness is 120 MPavm. The specimens are 10 mm thick. Determine whether the specimens are...
A. If a material is tested in the linear part of the engineering stress-strain curve, what is expected behavior? B. Define the two trigonometric parameters in the definition of critical resolved shear stress C. How can hardness be used in determining the tensile strength? D. If an alloy is produced with a fine grain size, will it have higher or lower strength an opposed to igcoarse grained counterpart? E. How can solid solutions enhance strength? ! F. What is the...
post
only Group#7
Problem 5 (6 marks) For the beam and loading shown, a) Draw the shear and bending-moment diagrams. b) Determine the maximum absolute value of the shear and bending moment. c) Determine the minimum required depth h of the beam. Knowing that the material used has an ultimate normal and shear stresses, use the given factor of safety in each loading case in the following table. P A LLL Dimensions, material properties and load values are presented in...
PLEASE MAKE SURE THE ANSWERS MATCH THE ONES GIVEN BETWEEN
PARENTHESES
1. Fluctuating loading. The cold-drawn AISI 1040 steel bar (S590 MPa, S 490 MPa) shown in the figure is subjected to the following different cyclic loading conditions. Estimate the fatigue factor of safety based on achieving infinite life (use Modified Goodman method) and the yielding factor of safety. If infinite life is not predicted, estimate the number of cycles to failure. The fatigue strength modification factor f 0.87. For...
7 a)
b)
c)
d)
Fracture toughness Kic of a material is: an indication of the materials ability to provide obstacles for dislocation motion. maximum ductility in the material an indication of the resistance a material offers to brittle fracture an indication of the materials endurance limit O maximum area under the stress-strain curve If the Kıc for Al2O3 is about 5 MPa.m 1/2, the Kıc for an Al alloy will be < 5 MPa.m 1/2 True O False The...
Question 3 For the simply supported steel beam with cross section and loading shown (see Figure 3a), knowing that uniformly distributed load w=60 kN/m, Young modulus E = 200 GPa, and yield stress Cyield=200 MPa (in both tension and compression). ул 15 mm w=60 kN/m ... 1 B A 15 mm + 300 mm IC - i 2.5m 1 1 15 mm 7.5m 1 150 mm Figure 3a (a) Check if: the beam is safe with respect to yielding (using...
(20%) Question 6. The elastic modulus, yield strength and ultimate strength of a certain material afe 110 GPa 2400 MPa and 265 MPal respectively. If a cylindrical bar of this material 380 mm long is subjected to a uniaxial tension test and its length is increased by an amount áf O.50 mm under a tensile load ót 6660 N.At the same time its diameter decreased by0,28 mm Calculate; a) The initial diameter of the bar, (8%) d b) Under an...
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