Homework Answers
All of the above .
As if surface finish is poor there may be crack develop of long length that may cause failure.
Tempereture is also effect brittleness , generally material become more brittle at low temperature.
Corrosion due to atmosphere may degrate material stength by making rust
Add Answer to:
The maximum stress that a brittle material can safely support in service can be difficult to...
A large plate of a completely brittle material is put under an 85 MPa tensile stress....
A large plate of a completely brittle material is put under an 85 MPa tensile stress. The Young's modulus of this material is 140 GPa, and its surface energy is 450 mJ/m2. A crack exists at the edge of the plate with the plane of the crack perpendicular to the tensile stress. Use the Griffith equation to calculate the maximum crack depth that can be tolerated without fracturing the plate under the 85 MPa tensile stress. (hint: A joule is...
Repeat Problem 3 of HW 6 for a brittle material, requiring the inclusion of stress concentration in the fillet radius.
Repeat Problem 3 of HW 6 for a brittle material, requiring the inclusion of stress concentration in the fillet radius. The cantilevered bar in the figure is made from a ductile material and is statically loaded with Fy = 250 lbf and Fx = Fz = 0. Analyze the stress situation in the small diameter at the shoulder at A by obtaining the following information. (a) Determine the precise location of the critical stress element at the cross section at A. (b) Sketch...
Rapid cooling (thermal shock) of a thin layer of material causes a thermal shock stress. the thermal shock stress can b...
Rapid cooling (thermal shock) of a thin layer of material causes a thermal shock stress. the thermal shock stress can be estimated by Εα(ΔT) σ, - σ 1-v Assume that a piece of materials in the table below contains a crack of a depth a 0.5 mm, calculate the surface temperature change necessary to cause brittle fracture for each material [6 marks]. Rank the materials in thermal shock resistance from the largest to the least [2 marks] hint: Y-0.72 small...
Determine the maximum shear force V that the strut can support if the allowable shear stress...
Determine the maximum shear force V that the strut can support if the allowable shear stress for the material is Talow-40 MPa. 12 mm 60 mm 12 mm 0 mm 20mm 20 mm
answer question 2 please A material may fail in many ways; in a ductile or brittle...
answer question 2 please
A material may fail in many ways; in a ductile or brittle mode; by creep or fatigue; by corrosion or stress corrosion; by hydrogen or liquid metal embrittlement; by slow tensile overload or by impact. An examination of the failure may tell you a lot about the material and the failure mode. In this course, you have learned (we trust) the correlations between structure-properties, - applications. This leads to material selection. However, the engineer has to...
can you help me with these practice problems Creep occurs by:- a. constant stress at room...
can you help me with these practice problems
Creep occurs by:- a. constant stress at room temperature, b. high temperatures over 1000C. c. constant stress at temperatures over 0.5 TM in K, d. none of these. Creep rates for polymers at 23C are:- a. high, b. low, c. same as metals. In a low carbon steel the upper yield point depends upon:- a. screw dislocations at grain boundaries, b. carbon atoms at dislocations, c. intersecting slip planes, d. second phases....
7) Which of the following is true? O The linear coefficient of thermal expansion is unique...
7) Which of the following is true? O The linear coefficient of thermal expansion is unique for each material (material property) O The displacement due to temperature is linearly related to the original length O Stress concentration factors relate the maximum stress to the average stress O Sharp corners should be avoided because they create stress concentrations. O All the above are true 8) Which of the following statements are true? O A simply supported beam which supports a load...
answer the following multiple choice questions 5. The most common phase serving . residence would be...
answer the following multiple choice questions
5. The most common phase serving . residence would be single phase bwo or double phase three phase multiple phases none of the answers provided RV9,1110 11. A KVA code letter indicates the innush current per hp. size of the short circult protectors size of the overcurrent protectors size of the thermal overloads none of the answers provided 6. RPM is the approximate speed under full-Hoad conditions when voltage is at rated value when...
this are very difficult questions for my environmental biology class. These are examples from the practice...
this are very difficult questions for my environmental biology
class. These are examples from the practice homework so can anyone
please help me check my answers.
-) The temperature classes of microorganisms are based on optimum temperatures of microbi A) cell wall C) cell membrane B) enzymes D) All of the above 20) Aerobic respiration, anaerobic respiration, and fermentation are all pathways of which involve the of nutrients. A) Catabolism, reduction B) Anabolism; oxidation C) Catabolism; oxidation D) Anabolism, reduction...
Item 1 In the case below, the original source material is given along with a sample...
Item 1 In the case below, the original source material is given along with a sample of student work. Determine the type of plagiarism by clicking the appropriate radio button. Original Source Material Student Version In the 1986 soccer World Cup final, the Argentine star Diego Maradona did not score a goal but his passes through a ring of West German defenders led to two Argentine goals. The value of a star cannot be assessed only by looking at his...
Rapid cooling (thermal shock) of a thin layer of material causes a thermal shock stress. the thermal shock stress can be estimated by Εα(ΔT) σ, - σ 1-v Assume that a piece of materials in the table below contains a crack of a depth a 0.5 mm, calculate the surface temperature change necessary to cause brittle fracture for each material [6 marks]. Rank the materials in thermal shock resistance from the largest to the least [2 marks] hint: Y-0.72 small...
Determine the maximum shear force V that the strut can support if the allowable shear stress for the material is Talow-40 MPa. 12 mm 60 mm 12 mm 0 mm 20mm 20 mm
answer question 2 please
A material may fail in many ways; in a ductile or brittle mode; by creep or fatigue; by corrosion or stress corrosion; by hydrogen or liquid metal embrittlement; by slow tensile overload or by impact. An examination of the failure may tell you a lot about the material and the failure mode. In this course, you have learned (we trust) the correlations between structure-properties, - applications. This leads to material selection. However, the engineer has to...
can you help me with these practice problems
Creep occurs by:- a. constant stress at room temperature, b. high temperatures over 1000C. c. constant stress at temperatures over 0.5 TM in K, d. none of these. Creep rates for polymers at 23C are:- a. high, b. low, c. same as metals. In a low carbon steel the upper yield point depends upon:- a. screw dislocations at grain boundaries, b. carbon atoms at dislocations, c. intersecting slip planes, d. second phases....
7) Which of the following is true? O The linear coefficient of thermal expansion is unique for each material (material property) O The displacement due to temperature is linearly related to the original length O Stress concentration factors relate the maximum stress to the average stress O Sharp corners should be avoided because they create stress concentrations. O All the above are true 8) Which of the following statements are true? O A simply supported beam which supports a load...
answer the following multiple choice questions
5. The most common phase serving . residence would be single phase bwo or double phase three phase multiple phases none of the answers provided RV9,1110 11. A KVA code letter indicates the innush current per hp. size of the short circult protectors size of the overcurrent protectors size of the thermal overloads none of the answers provided 6. RPM is the approximate speed under full-Hoad conditions when voltage is at rated value when...
this are very difficult questions for my environmental biology
class. These are examples from the practice homework so can anyone
please help me check my answers.
-) The temperature classes of microorganisms are based on optimum temperatures of microbi A) cell wall C) cell membrane B) enzymes D) All of the above 20) Aerobic respiration, anaerobic respiration, and fermentation are all pathways of which involve the of nutrients. A) Catabolism, reduction B) Anabolism; oxidation C) Catabolism; oxidation D) Anabolism, reduction...
Item 1 In the case below, the original source material is given along with a sample of student work. Determine the type of plagiarism by clicking the appropriate radio button. Original Source Material Student Version In the 1986 soccer World Cup final, the Argentine star Diego Maradona did not score a goal but his passes through a ring of West German defenders led to two Argentine goals. The value of a star cannot be assessed only by looking at his...
Most questions answered within 3 hours.
-
Discuss the similarities and differences between static and
flexible Budgeting and Capital budgeting. · Why is...
asked 1 minute ago -
With the demand for more nutritional food options growing,
Nutriment Biotech is positioned to become a...
asked 15 minutes ago -
A sample of hydrogen gas collected at a
pressure of 1.41 atm and a temperature of...
asked 11 minutes ago -
Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether there...
asked 9 minutes ago -
he plant started to purify its wastewater before discharging it
into the lake. How long will...
asked 10 minutes ago -
A
firm purchased telephone equipment for cash. By mistake, the person
who recorded the transaction debited...
asked 11 minutes ago -
A 1.50 kg sample of water at 15.0°C is in a calorimeter. You
drop a piece...
asked 11 minutes ago -
Thiazyl fluoride, F3NS is a colourless gas. Using concepts of
electronegativity, formal charge etc. determine the...
asked 12 minutes ago -
In August 1992, after three years of development,
Colgate-Palmolive (CP) is about to add a new,...
asked 18 minutes ago -
1.Calculate the volume in liters of a 3.10 M KCl solution to
obtain 0.15 mol of...
asked 34 minutes ago -
The payback method is often criticized because it ignores the
time value of money and cashflows...
asked 37 minutes ago -
The overall population for Region A is 122122 million people.
The labor force contains 5151 million...
asked 56 minutes ago