1. Compare Stearns' Type 2 fracture pattern to the okljoints from the class notes. Draw a diagram and discuss the nature and occurrence of the fracture(s)

1. Compare Stearns'Type 1 fracture pattern to the okl and the hko joints from the cla notes and from the text. Draw a diagram and discuss the nature and occurrence of the fracture(s)

《纺织复合材料》课程参考文献（Micromechanisms of Fracture and Fatigue）Chapter 3 Fatigue Fracture

《纺织复合材料》课程参考文献（Micromechanisms of Fracture and Fatigue）Chapter 2 Brittle and Ductile Fracture

磨损 Abrasion Abrasion 磨牙症 Bruxism Bruxism 楔状缺损 Wedge-shaped defect Wedge-shaped defect 酸蚀症 Erosion Erosion 牙隐裂 Cracked tooth Cracked tooth 牙根纵裂 Vertical root fracture Vertical root fracture

《纺织复合材料》课程参考文献（Micromechanisms of Fracture and Fatigue）Chapter 1 Deformation and Fracture of Perfect Crystals

1. Compare Stearns' Type 1 fracture pattern to the okl and the hk0 joints from the class notes and from the text. Draw a diagram and discuss the nature and occurrence of the fracture(s)

Principal Aim To assess the strength changes, and associated change in fracture risk, due to structural alterations in the proximal femora of astronauts experiencing long￾term weightlessness

一、破裂（FRACTURE）指岩石体（地质体）中由脆性破裂作用形成的不连续面（带）。 二、 特征 岩石体（地质体或物体）失掉连续性

Overview Definition : Osteoporosis is a bone disease in which the amount of bone is decreased and the structural integrity of trabecular bone is impaired. Cortical bone becomes more porous and thinner. This makes the bone weaker and more likely to fracture