True or false: As a perfectly elastic material, wood recovers from applied load rapidly. Select one: O True O False
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- The wood has an allowable normal stress of Oallow = 15 MPa and an allowable shear stress of Tallow = 1.33 MPa. (Figure 1) Part A Determine the minimum dimension h of the beam's cross section to safely support the load. Express your answer to three significant figures and include the appropriate units. µA ? h = Value Units Submit Request Answer Figure Provide Feedback 25 kN/m B 2 m 100 mmCalculate the modulus of elasticity of the wood specimen with the stress-strain relationshipshown in figure below.A beam will support a combination of dead, live, and earthquake loads. The Load Duration Factor for Dead is 0.9, Live is 1.0, and Earthquake is 1.6. The Dead load causes a stress of 300 psi, the live load causes a stress of 200 psi, and the earthquake causes a stress of 100 psi. The tabulated strength of the wood is 1000 psi. What is the critical (largest) Demand/Capacity ratio for the beam? (Demand/Capacity is fb/Fb'.)
- The two pieces of wood, 2 in. by 4 in., are glued together along the 40° joint. Determine the maximum safe axial load P that can be applied if the shear stress in the glue is limited to 250 psi.Calculate the modulus of elasticity of the wood specimen with the stress-strain relationship shown in figure below. 25 20 15 10 0.1 0.2 0.3 0.4 0.5 STRAIN (%) COMPRESSIVE STRESS PARALLEL TO GRAINS (MPA)A wood beam reinforced by an aluminum channel section is shown in the figure. 150 mm 230 mm 38 mm 6.5 mm -163 mm- The beam has a cross section of dimensions 150 mm x 230 mm, and the channel has a uniform thickness of 6.5 mm. If the allowable stresses in the wood and aluminum are 8 MPa and 50 MPa, respectively, and if their moduli of elasticity are in the ratio 1 to 6, what is the maximum allowable bending moment for the beam? Enter the magnitude in kN · m. (Assume that the component parts of the beam are securely bonded by adhesives or connected by fasteners. Also, be sure to use the transformed-section method in the solution.) (No Response) 14.06 kN· m
- The grains of wood in the board make an angle of 20° with the horizontal as shown. The board is subjected to an axial load of P = 300 N. (Figure 1) Part A Determine the normal stress that acts perpendicular to the grains. Express your answer to three significant figures and include the appropriate units. µA Value Units Submit Request Answer Figure < 1 of 1 Part B Determine the shear stress that acts parallel to the grains. Express your answer to three significant figures and include the appropriate units. HA -300 mm 160 mm Ta'y = Value Units 20° 25 mm1 Submit Request AnswerQuestion 25 What factors make wood more flexible in the longitudinal direction? a. low moisture content b. knots c. high microfibril angle Od. high densityProblem Steel and aluminum plates are used to reinforced an 80 mm by 150 mm timber beam. The three materials are fastened firmly as shown so that there will be no relative movement between them. 80 mm Steel Wood Aluminum 20 mm 150 mm 50 mm Given the following material properties: Allowable Bending Stress, F Steel = 120 MPa Aluminum = 80 MPa Wood = 10 MPa Find the safe resisting moment of the beam in kN.m. Modulus of Elasticity, E Steel = 200 GPa Aluminum = 70 GPa Wood 10 GPa
- State five different imperfections that may be found in lumber, and brieflydefine them.The composite bar, firmly attached to unyielding supports, is initially stress free. What maximum axial load P can be applied if the allowable stresses are 100 MPa for aluminum and 140 MPa for steel? Bronze Steel A = 1800 mm² A = 1125 mm? E = 83 GPa %3D E = 200 GPa %3D P -450 mm- 360 mm·Question 7 When wood is stretched in the longitudinal direction, most of the stress is taken by a. hydrogen bonds O b. covalent bonds