Abstract
Bone tissue is a composite material composed of hydroxyapatite (HAp) and collagen. In the X-ray diffraction method using characteristic X-ray with a unique wavelength, HAp in compact bone has much lower crystallization than metal as steel. The peak position of diffracted intensity is not easy to determine from the gradual intensity-angle profile. This work proposes a method to calculate the lattice strain from the information of a whole diffracted profile without a peak position. In this experiment, strip specimens of 28×8×2 mm in size with their long axis aligned to the bone axial or the circumferential direction were cut from cortical bone in a shaft of bovine femur. To confirm the relationship between applied macroscopic strain and lattice strain in bone tissue, a four-point bending device was developed to apply bending load to the specimen during the X-ray irradiation. As a result, the accuracy of measurement by this method was better improved.
