Experiment #8 Shear Test on Metal Fastners

9:00 blai 3 If the original specimen length is 76 (b) mm, what is the maximum length to which it may be stretched without ?causing plastic deformation إجابتك bläi 4 A cylindrical specimen of a nickel alloy having an elastic modulus of 207 GPa and an original diameter of 10.2 mm will experience only elastic deformation when a tensile load of 8900 N is applied. Compute the maximum length of the specimen before deformation if the maximum .allowable elongation is O.25 mm إجابتك Select the valid answer(s) نقطة واحدة :Metals .ying-ability is due to

10. A standard steel specimen of 0.504" diameter elongated 0.0125" in an 8" gage length during a test where it was subjected to a tensile force of 6249 lb. If the specimen's gage length was measured to be 8.0025" after the test was over, what was the permanent plastic deformation? What is the elastic deformation and what is the modulus of elasticity of that metal? r PL AE

Question 2 In designing prosthetic sockets, the latter will need to be experimentally tested for their structural integrity. Figure 2 shows one such design of a prosthetic socket which is made of carbon fibre composite. Strain gauges are installed to record the strains at various locations of the legs during walking and the readings are recorded using a telemetry system to detemine the critical stressed area. At a particular strain gauge location indicated in Figure 2, the readings recorded by one of the 45° strain gauge rosettes are: Ea = 2500 x 10*, es = 1500 x 10°, & = -950 x 10* Using Mohr's Cicle or otherwise, detemine: (a) the principal strains and the direction of the maximum principal strain relative to the gauge "a". (b) the corresponding principal stresses and sketch the results on a properly oriented element. You may assume that the prosthetic socket is made of polypropylene whose Young's modulus of 1.0 GPa and Poisson ratio of 0.3. Figure 2

At higher temperature, strength and strain hardening are increased, whereas, ductility is decreased which permits greater plastic deformation True False O Saaly i The strength constant (C) is increased with increasing of temperature True O False O The metal is becoming weaker as strain increases, this is because of .strain hardening (work hardening) property True O False O ly The engineering stress and strain are defined relative to the instantaneous area and length of test specimen True O False O In sheetmetal working processes, the surface area-to-volume ratio of .w.p. is low True O False O aly ihi Determine the value of the strain-hardening exponent for a metal that will cause the average flow stress to be 70% of the final flow stress after deformation 0.444 0.421 0.422 0.428 aaly i For pure copper (annealed), the strength coefficient = 330 MPa and strain-hardening exponent = 0.52 in the flow curve equation. Determine the average flow stress that the metal experiences if it is…

Flag question You have been given the following test sample data following mechanical testing of 15 test pieces of a modified Alumina. What is the Weibull modulus of this material? Would you advise the use of this material over one with a Weibull Modulus of 19.6 and a mean failure stress of 270 MPa, if you anticipate that the peak stress on the material could be 255 MPa? Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Select one or more: Failure Stress (MPa) 297 293 270 300 260 286 265 295 4 293 280 288 263 290 298 275

10. The following results were obtained in a tensile test on a mild steel specimen of original diameter 20 mm and gauge length 40 mm. Load at limit of proportionality 80 kN Extension at 80 kN load 0.048 mm Load at yield point 85 kN Maximum load 150 kN When the two parts were fitted together after being broken, the length between gauge length was found to be 55.6 mm and the diameter at the neck was 15.8 mm. Calculate Young's modulus, yield stress, ultimate tensile stress, percentage elongation and percentage [Ans. 213 kN/mm2; 270 N/mm²; 478 N/mm²; 39%; 38%] reduction in area.

Select one or more: a. 28.6 Ob. 22.8 O c. 3.7 Od. No Oe. 4.9 Of. Yes 0 8 9 10 11 12 13 14 15 g. 18.5 295 293 280 288 263 290 298 275

02: A steel specimen 12mm diameter has gauge length 50mm. the steel specimen had tested via tensile test under maximum load 66KN with elongation 7.5mm, and the yield load of this specimen is 15KN with elongation 2.4mm. Calculate: 1- The engineering ultimate stress (ultimate tensile strength), and engineering strain at this point. 2- The engineering stress and strain at yield point. 3- The modulus of elasticity, and the modulus of resilience. 4- The final or fracture strain of a steel specimen, if you know that the final length of specimen after testing is 58.5mm. 5- The true stress and strain for ultimate point.

QUESTION The following data were obtained during a tension test of a low carbon steel specimen having a gauge length of 100 mm. At the point where the stress strain curve deviated from linearity, the load was 35KN, the gauge length was 102.5 mm and the diameter of the specimen was 1.6 mm. Before necking began, loads of 45 KN and 55 KN produced gauge lengths of 103.4 mm and 107.7 mm respectively. Calculate (a) The Modulus of elasticity (b) The Strainhardening exponent

A tensile test was performed on a metal specimen with a diameter of 1/2 inch and a gage length (the length over which the elongation is meas- ured) of 4 inches. The data were plotted on a load-displacement graph, P vs. AL. A best-fit line was drawn through the points, and the slope of the straight-line portion was calculated to be P/AL = 1392 kips/in. What is the modulus of elasticity? BI

The % of error between a theoretical shear modulus of 65 GPa and an experimental modulus of rigidity of 60235 MPa is: Select one: O a. 0.0791 % O b. 7.33 % O c. 0.0668 % O d. 7.9 % Torrion test is annlied to study the properties of a material subjected to tensile force.

6. State your answers to the following questions.Strain Gauge represents the deformation of a material through a change in resistance. If so, explain how temperature will affect the strain gauge in the experimental environment.①:In this experiment, the Strain Gauge measures the strain in micro units. Explain one possible error factor when applying a load by hanging a weight on the material with the strain gauge attached. (Hint: It is easy to shake by hanging the weight using a thread)①:

Need help starting this assignment.  1- Determine the maximum normal stress, the maximum shear stress, the Modulus of Elasticity, the maximum bending moment and the maximum stress due to bending (also known as flexure stress) on the material, from the information provided. 2- From the results of your analysis, determine what material was used for this test. Check whether the material can withstand the different types of loading the hip implant experiences. Use a factor of safety of 4.

No wrong answer please , i could downvote The piece of suture is tested for its stress relaxation properties after cutting 3 cm long sample with a diameter of 1mm. The initial force recorded after stretching 0.1 cm between grips was 5 Newtons. Assume the suture material behave as if it has one relaxation time. The gage length was 1 cm. a. Calculate the initial stress. b. Calculate the initial strain. c. Calculate the modulus of elasticity of the suture if the initial stretching can be considered as linear and elastic. d. Calculate the relaxation time if the force recorded after 10 hours is 4 Newtons.

D- EVEN: The following data are taken from a 25mm in diameter bar of length 250mm, the following results were recorded. Assume that the curve of the stress-strain diagram is linear from the origin to the first point. P (load in kN) 8(elongation in mm) 0.2 0.3 112 154 167 0.4 0.5 0.6 174 181 Determine the a. Stress at 167 KN load in MPa b. Strain at 167 kN load in mm/mm (expressed in scientific notation) c. Modulus of elasticity MPa d. Modulus of resilience in N-mm/mm3 e. Modulus of toughness in N-mm/mm3

A three-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 5.6 mm; the specimen fractured at a load of 4280 N when the distance between support points was 43 mm. Another test is to be performed on a specimen of this same material, but one that has a square cross section of 18 mm in length on each edge. At what load would you expect this specimen to fracture if the support point separation is maintained at 43 mm? Ff= N

You have been given the following test sample data following mechanical testing of 15 test pieces of Silicon Nitride. What is the Weibull modulus of this material? Would you advise the use of a similar material with a Weibull Modulus of 16.3 and a mean failure stress of 485 MPa, if you anticipate that the peak stress on the material could be 430 MPa? Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Select one or more: O a. No O b. 18.6 O C. 13.4 O d. Yes O e. 15.7 f. 17.1 Failure Stress (MPa) 423 459 496 432 447 467 473 499 485 479 505 530 526 490 510 <

ICLASS DISCUSSION ITEM 9.8 Piezoresistive Effect in Strain Gages For a typical metal foil strain gage with a gage factor of 2.0, how large is the piezo- resistive effect in comparison to the effects of change in area and change in length?

You are developing a test plan for a temperature cycling test of 300 cycles of T min, T max. How would you take into account the size and weight of your product when determining the duration of temperature dwells at Tmin and Tmax and the transition time between them?

Q2/ Aluminum tensile specimen with 12.5mm diameter, a gauge length of 50.8mm and the final diameter was 10.5mm. • Plot the engineering stress-strain curve and the true stress- strain curve. Determine proportion limit, young's modulus, the yield point, the ultimate tensile strength, the failure stress on drawing? • Determine Ductility? • Determine Resilience modulus and toughness modulus? 0.006 0.008 0.012 0.017 Strain mm/mm Apparent Stress N/mm 100 0.004 0.22 0.25 0.27 150 200 290 325 480 450 410 True stress N/mm 100.1 150.3 201 326 400 500 550 620

What is self-heating in strain gauges? Why is it caused and what are its implications on end result?

A tension test was conducted for a cylindrical specimen of stain-less steel having an initial diameter (D) of 15.55 mm. Calculate the percentage reduction in area if the final diameter of the specimen (d) is 7.35 mm. Select one: O a. 76.66% O b. 78.66% O c. 77.66% O d. 79.66%

Question 5: The graph below gives a plot of force versus total sample length in a tensile test of a polymer. The sample is cylindrical, with an initial diameter of 1 cm and an initial length of 10 cm. From the data below, calculate the modulus, yield stress, yield strain, tensile strength, and % elongation. 1200 800 10 12 13 14 15 Lensth (cm) Force (N)

Figure 1 shows the tensile testing results for different materials. All specimens have an initial diameter of 12 mm and an initial gauge length of 50 mm. 300 250 Low carbon steel Network polymer 200 Crystalline polymer 150 Amorphous polymer 100 50 5 10 15 20 25 30 Strain (%) Figure 1: Stress-strain curve b. Determine the following parameters for each material: • the tensile strength the 0.2% offset yield strength the modulus of elasticity • the ductility Stress (MPa) LO

39) A tensile test specimen has a gauge length=2in. and a diameter of 0.875in. Yielding occurs at a load of 35,500lbs. The corresponding gauge length = 2.0113in. (neglect the .2% yield point). The maximum load of 45,000lbs is reached at a gauge length of 2.543in.  If fracture occurs at a gauge length of 2.673in, determine the percent elongation at fracture (Round to the nearest whole %)

Bronze alloy, the following true stresses produce the corresponding plastic true strains, before to necking: On the basis of this information, compute the true stress necessary to produce a true strain of 0.25 and then find the engineering stress and strain at this point. True stresses (MPa) True strain 354 0121 70 018

Given: Stress strain curve of 10 mm diameter and 1 m long ductile stainless-steel rod. 900 800 700 600 500 Mild 400 Stainless 300 200 - 100 0.1 0.2 0.3 0.4 Strain 0.5 0.6 0.7 Draw stress-strain curve for compression here 1. Label all points of significance on the stress strain curve 2. Draw the stress-strain curve for the rod in compression and label all points of significance. 3. What is the Young's modulus in tension? Assume .001 strain at 500 MPa 4. What is its Youngʻs modulus in compression? 5. What is the tensile yield strength of this rod using the 0.2% offset criteria? 6. What is the compressive yield strength of the rod? 7. What is force required to yield the rod?. Show calculation: 8. What is the UTS of this rod?. 9. What is the force required to break the rod? Show calculation: 10. What will be UCS of the rod? Stress (MPa)

Q2) Based on data below, draw the S-N curve for fatigue test if the specimen have neck diameter 5mm, and length between applied lode and neck diameter 30mm. Hint : Ix=(pi*D^4)/64 Number of cycle (cycle) Load ( N) 100 1*10^4 90 5*10^4 80 1*10^5 60 1*10^6 50 5*10^6 40 1*10^7 a-Find the fatigue strength at 5*10^5 cycle on curve b-Find Endurance limit and show it on curve