Question B6. Which of the following is not correct? (a) The modulus of timber depends on the density of the timber....
Question B6. Which of the following is not correct? (a) The modulus of timber depends on the density of the timber. (b) Timber is a composite based on cellulose polymers which means that its properties are time dependent and timber will creep with time under load. (c) The toughness of timber is reduced by the presence of knots and defects in the structure. (d) Timber is usually dried before use to reduce its moisture content and reduce warping during use. (e) The toughness of timber is lower across the grain than along the grain. Question B7 Consider the Galvanic series below for materials in sea water. Platinum Gold Graphite Titanium Silver [316 Stainless steel (passive) 304 Stainless steel (passive) Inconel (80Ni-13Cr-7Fe) (passive) Nickel (passive) Monel (70Ni-30Cu) Copper-nickel alloys Bronzes (Cu-Sn alloys) Copper Brasses (Cu-Zn alloys) [Inconel (active) Nickel (active) Tin Lead [316 Stainless steel (active) 304 Stainless steel (active) Cast iron Iron and steel Aluminum alloys Cadmium Increasingly inert (cathodic) Increasingly active (anodic) Commercially pure aluminum Zinc Magnesium and magnesium alloys Source: M. G. Fontana, Corrosion Engineering, 3rd edition. Copyright 1986 by McGraw-Hill Book Company. Reprinted with permission. Page 12 of 16
Question B6. Which of the following is not correct? (a) The modulus of timber depends on the density of the timber. (b) Timber is a composite based on cellulose polymers which means that its properties are time dependent and timber will creep with time under load. (c) The toughness of timber is reduced by the presence of knots and defects in the structure. (d) Timber is usually dried before use to reduce its moisture content and reduce warping during use. (e) The toughness of timber is lower across the grain than along the grain. Question B7 Consider the Galvanic series below for materials in sea water. Platinum Gold Graphite Titanium Silver [316 Stainless steel (passive) 304 Stainless steel (passive) Inconel (80Ni-13Cr-7Fe) (passive) Nickel (passive) Monel (70Ni-30Cu) Copper-nickel alloys Bronzes (Cu-Sn alloys) Copper Brasses (Cu-Zn alloys) [Inconel (active) Nickel (active) Tin Lead [316 Stainless steel (active) 304 Stainless steel (active) Cast iron Iron and steel Aluminum alloys Cadmium Increasingly inert (cathodic) Increasingly active (anodic) Commercially pure aluminum Zinc Magnesium and magnesium alloys Source: M. G. Fontana, Corrosion Engineering, 3rd edition. Copyright 1986 by McGraw-Hill Book Company. Reprinted with permission. Page 12 of 16