Elastic waves - Life is

Japanese: 弾性波 - だんせいは

A wave that travels through an elastic body (a material that undergoes deformation when a force is applied to it, and returns to its original shape when the force is removed, with no residual deformation). Examples include sound waves and seismic waves. There are longitudinal waves, which are generated by volume elasticity associated with a change in volume, with the displacement direction of the elastic medium being parallel to the direction of wave propagation, and transverse waves, which are generated by shape elasticity associated with a change in shape while maintaining the same volume, with the displacement direction of the medium being perpendicular to the direction of wave propagation. Both longitudinal and transverse waves occur in solids, but transverse waves as elastic waves do not occur in fluids such as liquids and gases that do not exhibit elasticity against shear. The propagation speed is related to the elastic modulus and density of the medium, and the speeds of longitudinal and transverse waves in an isotropic elastic body are given by (Equation 1), respectively (K is the bulk modulus, G is the modulus of rigidity, ν is the Poisson's ratio, and ρ is density). →Elasticity/Elastic modulus

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

弾性体（物体に力を加えると変形をおこし，その力を取り除くと元の形に戻り変形が残らない物質）内を伝わる波。音波，地震波がその例。弾性媒質の変位方向が波の進行方向に平行で，体積変化に伴う体積弾性によって生ずる縦波と，媒質の変位方向が波の進行方向に直角で，等体積のままの形状変化に伴う形状弾性によって生ずる横波とがある。固体では縦波・横波とも起こるが，ずれに対して弾性を示さない液体や気体などの流体では弾性波としての横波は起こらない。伝搬速度は媒質の弾性率と密度に関係し，等方性弾性体内の縦波，横波の速さはそれぞれ（式１）で与えられる（Kは体積弾性率，Gは剛性率，νはポアソン比，ρは密度）。→弾性／弾性率

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