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- Composite _________ is produced by laying fibers in random directions in a plane.The frame of a space shuttle type vehicle must have a high yield strength and high stillness, and the most important design factor is weight. Of all the materials presented in this chapter, what material might be the most suitable for the frame of a space shuttle? Assume that there will be both tensile and compressive stresses. For a space shuttle, cost is not a limiting factor. (a) You can eliminate entire classes of materials from consideration with a brief statement about their unsuitability. (b) What material has the highest specific yield strength? Give the yield strength, specific gravity, specific yield strength, elastic modulus, and specific elastic modulus for this material. (c) What material has the highest specific elastic modulus? Give the yield strength, specific gravity, specific yield strength, elastic modulus, and specific elastic modulus for this material. (d) Compare the materials with the highest specific yield strength and highest specific elastic modulus for suitability in the space shuttle frame. (C) Discuss the suitability of the top-rated material for this design from the viewpoint of the ability to produce a frame.A bar having the cross section shown has been formed by securely bonding brass and aluminum stock. Using the data given in the table, determine the largest permissible bending moment when the composite bar is bent about a horizontal axis. Take x = 32 mm. Modalus of elasticity Allowable stress Aluminum Brass Aluminum 70 GPa 100 MPa 10 mm 10 mm Brass 105 GPa 160 MPa 10 mm mm 10 mm The largest permissible bending moment when the composite bar is bent about a horizontal axis is [ kN-m.
- A bar having the cross section shown has been formed by securely bonding brass and aluminum stock. Using the data given in the table, determine the largest permissible bending moment when the composite bar is bent about a vertical axis. Take x = 30 mm. Modulus of elasticity Allowable stress Aluminum Aluminum 70 GPa 100 MPa 10 mm Brass- 10 mm 40 mm- Brass 105 GPa 160 MPa 10 mm X 10 mm t The largest permissible bending moment when the composite bar is bent about a vertical axis is 1.689 kN-m.A flat bar of aluminum alloy 25 mm wide and 5 mm thick is placed between two steel bars each 25 mm wide and 10 mm thick to form a composite bar 25 mm x 25 mm as shown. The three bars are fastened together at their ends when the temperature is 15℃. Find the stress in each of the materials when the temperature of the whole assembly is raised to 55 ℃.Steel: Es = 200 GPa; Coefficient of expansion = 1.2x10^-5/℃.Aluminum: Eal = 200/3 GPa; Coefficient of expansion = 2.3x10-5/℃.A composite bar made up of aluminum and steel is held between two supports as shown. The bars are stress-free at a temperature of 40 degrees Celsius. What will be the stresses in the two bars when the temperature is 20 degrees Celsius if the supports are non-yielding. -Steel Aluminium Steel: a = 11.7x10-6/°C; Es = 210 GN/m² Aluminum: a = 25 mm 50 mm -0.3 m- 23.4x10-6/°C; EA 74 GN/m² -0.6 m- M
- A composite bar is made by connecting a steel bar with a length of Lst = 300 mm and an brass bar with a length of Lpr= 300 mm as shown. If the composite bar just fits between the supports when the temperature is 15 °C, determine the magnitude of the axial force in the composite bar when the temperature is 42 °C. Express your answer in kN to the nearest 100 N. %3D Brass Steel Epr = 100 GPa Eg = 200 GPa ag = 12(10¬6)/°C Ag = 200 mm² %3D apr = 21(10-6)/°C Abr = 450 mm² %3D %3D Lorwhat is design strength. The material of the steel is SM275 and the size is 22mm. The sectional area is 1,650mm^2.A composite bar is fabricated by brazing aluminum alloy [E = 10,000 ksi] bars (1) to a center brass [E = 17,000 ksi] bar (2) as shown in the fıgure. Assume d = 0.65 in., a = 0.1835 in., L = 22 in. If the total axial force carried by the two aluminum bars must equal the axial force carried by the brass bar, calculate the thickness b required for brass bar (2). Brass (2) Aluminum (1) (1) P a b = i in.
- 7 Has the same composition at any point? a. Isotropic b. Composite c. Prismatic d. Homogeneous 8. The composite material exhibits elastic properties in one direction different from that in the perpendicular direction. Orthotropic b. Anisotropic Isotropic d. Aeolotropic а. с. Materials having the same properties in all directions. a. Isotropic b. Anisotropic c. Aeolotropic d. Orthotropic 10 The term for the value above which the stress is no longer proportional to the strain. a. Proportional limit b. Plastic Range Rupture Stress d. Elastic Range с.a) Determine the location of the centroid with respect to the point P; y = mm Submit part Unanswered b) Determine the moment of inertia l with respect to the centroidal axes. x106 mm*REACTION OF A RIGID PLATE II A) Determine the internal and external reaction forces of a composite structure. To check the solution you will need to specify reaction components Ax, Az, Ma, Bx, Bz (body II), Cx, Cz (body III), Dx, Dz, Ex, Ez (body IV), Fx, Fz (body V), G (force transmitted by the member gj), H (force transmitted by the member hj), Kx, Kz. coefficient's are a= 1,1 b= 0,6 c=1.1