A)Thermal expansion:polymers>metals>ceramics From the above comparison,B)ceramics have the lowest CTE and C)polymers have the weakest bonding forces among the aforementioned materials. 2.(4pts) stepl:determine the coordinates of the two points: head point coordinates 2/3,1,0 tail point coordinates 0.0.0 step 2:subtract the second point from the first point 2/3,1,0 step 3:clear fractions(multiply by 3)and reduce to lowest integers:230 step 4:record the numbers in brackets with no commas separating the numbers,[230] 3. (4 points) 1)0.5point/answer;2)This stress-strain diagram is for a ductile material.Compared to a brittle material,a ductile material has greater difference between the yield strength and the tensile strength,and also has greater amount of plastic deformation prior to fracture (1.5points). Modulus 0时 elasticity tensile strength yield strength 4 6 plastic region Strain (e)mm/mm Elastic region PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint.com,cn 3 A) Thermal expansion: polymers>metals>ceramics From the above comparison, B) ceramics have the lowest CTE and C) polymers have the weakest bonding forces among the aforementioned materials. 2. (4pts) step1: determine the coordinates of the two points: head point coordinates 2/3, 1, 0 tail point coordinates 0, 0, 0 step 2: subtract the second point from the first point 2/3, 1, 0 step 3: clear fractions (multiply by 3) and reduce to lowest integers: 2 3 0 step 4: record the numbers in brackets with no commas separating the numbers, [230] 3. (4 points) 1) 0.5point/answer; 2) This stress-strain diagram is for a ductile material. Compared to a brittle material, a ductile material has greater difference between the yield strength and the tensile strength, and also has greater amount of plastic deformation prior to fracture (1.5points). Ds De tensile strength yield strength plastic region Elastic region Modulus of elasticity PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn