ith neat sketches show three modes of fracture in a cracked material
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With neat sketches show three modes of fracture in a cracked material
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- Methods of Consistent DeformationsNoncontact deformation measuring technique is preferred in many situations.A brass specimen of the circular cross-section is fractured at 151 kN force and the final length of the specimen at fracture is 48 mm. The fracture strength of the specimen is found to be 72 kN/mm?. The percentage of elongation of the specimen is 44 %. Determine the following (i) Diameter of the specimen, ii) Initial length of the specimen, iii) Stress under an elastic load of 15 kN, iv) Young's Modulus if the elongation is 1.5 mm at 15 kN (v) Final diameter if the percentage of reduction in area is 21 %. ( Initial Cross-sectional Area (in mm?) The Diameter of the Specimen (in mm) Initial Length of the Specimen (in mm) Stress under the elastic load (in N/mm?) Young's Modulus of the Specimen (in N/mm2) Final Area of the Specimen at Fracture (in mm) Final Diameter of the Specimen after Fracture (in mm)
- A hot rolled steel tension test sample has a diameter of 6 mm and the original gage length of 30 mm. In a test to fracture, the stress and strain data below were obtained. Determine Generic Strain Value, %0.2 offset strain, and Calculated stress at %0.2 offset. Original diameter - 6mm Original Length - 30 mm Fracture diameter - 4.54 mmIn a bending test for a brittle material, the distance between the supports is 300mm, the cross sectional area of the specimen is 1200 ??2and the thickness is 30mm. find the transverse rupture strength if the applied load was 1 tonFor the stress-strain diagram, which region or point represents fracture?
- The limit load of an elastic-plastic cracked three-point bend beam (Figure QA1) with S = 4W = 120 mm, crack length a and a/W = 0.4 is (PL)c. Calculate %3D the crack opening stress at a distance of 0.5 mm ahead of the crack tip in an elastic specimen subjected to bending load equal to the limit load. Assume that the materials yield strength is equal to oy 300 MPa and the specimen is under plane strain condition. Figure QA1: three-point bend beam P. SIA very large, steel plate of yield stress 200 MPa has a crack at the centre of length 18 mm, orientated along the x-axis. If the plate is subjected to far field tensile loading of magnitude 179 MPa and is assumed to be in a state of plane strain, determine the extent of the plastic region at the crack tip, along the x-axis. You may assume Poisson's ratio is (1/3). Express your answer as an integer value of mm.A brass specimen of the circular cross-section is fractured at 151 kN force and the final length of the specimen at fracture is 49 mm. The fracture strength of the specimen is found to be 74 kN/mm2. The percentage of elongation of the specimen is 42 %. Determine the following (i) Diameter of the specimen ii) Initial length of the specimen iii) Stress under an elastic load of 16 kN iv) Young's Modulus if the elongation is 1.6 mm at 16 kN (v) Final diameter if the percentage of reduction in area is 20 % solve: Initial Cross-sectional Area (in mm2) = The Diameter of the Specimen (in mm) = Initial Length of the Specimen (in mm) =
- The data shown in the table below were obtained from a tensile test of high-strength steel. The test specimen had a diameter of 13mm and a gage length of 50mm. At the fracture, the elongation between the gage marks was 3.0mm and the minimum diameter was 10.7mm. Plot the conventional stress-strain curve for the steel and determine the proportional limit, modulus of elasticity (i.e the slope of initial part of the stress-strain curve), yield stress at 0.1% offset, ultimate stress, percent elongation in 50mm, and percentage reduction in area Tensile-Test Data Load(kN) Elongation (mm) 5 0.005 10 0.015 30 0.048 50 0.084 60 0.099 64.5 0.109 67.0 0.119 68.0 0.137 69.0 0.160 70.0 0.229 72.0 0.259 76.0 0.330 84.0 0.584 92.0 0.853 100.0 1.288 112.0 2.814 113.0 FractureState the difference between cleavage and fracture of minerals, using quartz and mica as examples.Assuming you have been offered a job position as the lead Engineer to supervise the restoration of a steel bridge that collapsed due to fracture. The laboratory results of the wreckage (a truss) given to you show an internal crack whose length is 0.026 mm and radius of curvature is 0.00028mm. If the material theoretical fracture strength is 2000 MPa, determine the allowable applied stress. O a. 145.10 MPa O b. 135.65 MPa OC. 128.17 MPa Od. 156.04 MPa O e. 146.76 MPa