edical Fracture (6 pts -What is NOT true about Fracture Toughness (C)? a. In-pla

Question

edical Fracture (6 pts -What is NOT true about Fracture Toughness (C)? a. In-plane tension (KIC) is the most commonly encountered displacement mode of crack surface b. Kc is a material property C. Kc can be estimated by the area under Stress x Strain curve d. Kc measures a material's resistance to fracture when a crack is present 12- An anisotropic material is one which a. Has different material properties when measured in different directions b. Is a composite c. Has the same material properties when measured in different directions d. Is a very flexible material 13 - Which is the correct order of materials from most brittle to most ductile? a. Copper, Wood, Glass b. Wood, Copper, Glass c. Glass, Copper, Wood d. Glass, Wood, Copper

Explanation / Answer

11. We know fracture toughness K is a material property that describes the ability of a material to resist fracture. Critical fracture toughness is represented by Kc and it measures the material resistance to fracture when a crack is present . Kc can be estimated by the area under stress x strain curve and it depends on the specimen geometry (specifically thickness). Kc decreases as size increases and it reaches a minimum value for thick specimens known as plane strain fracture toughness, Kic. Kic is a material parameter and is the most commonly encountered mode of crack surface displacement. Therefore, statement (b) is NOT true.

12. We know that a composite material is the one, which is made up of two or more constituent materials with significantly different physical or chemical properties. An isotropic material is the one which has the same material properties when measured in different direction. A material is said to be anisotropic when the properties of a material vary with different crystallographic orientations. An anisotropic material is generally not very flexible because it has different elasticity is different directions. Therefore, your answer is (a).

13. We know glass is most brittle as it absorbs relatively little energy prior to fracture and shows no plasticity before deformation. Also, wood is more ductile than metals like copper because of the high tensile strength of its fibers. Therefore, your correct order is Glass, Copper, Wood, hence correct answer is (c).

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