normal strain

…( d - d ₀ )/ d ₀ is called the transverse strain at this time. The longitudinal strain minus the transverse strain is collectively called the normal strain, and the ratio of the transverse strain ε ₁ to the longitudinal strain ε is called the Poisson's ratio. Next, as shown in Figure 2, when a rectangular parallelepiped of height h ₀ is deformed (sheared) so that two parallel faces are displaced, the angle of the displacement (shear angle) is γ (units are rad), and this γ is called the shear strain (since strain is the amount of deformation per unit dimension, originally shear strain is defined as λ/ h ₀ = tanγ in the figure, but if the deformation is small, tanγ = γ can be used, and it is given as the change in angle). …

*Some of the terminology that refers to "normal strain" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…(d－d₀)/d₀を，このときの横ひずみという。縦ひずみ‐横ひずみを垂直ひずみnormal strainと総称し，横ひずみε₁と縦ひずみεの比はポアソン比と呼ぶ。　次に図2に示すように，高さh₀の直方体を互いに平行な2面がずれるように変形(せん断変形)させたとき，そのずれの角(せん断角)をγ(単位はrad)とすると，このγをせん断ひずみshear strainという(ひずみは単位寸法あたりの変形量であるから，本来，せん断ひずみは図においてλ/h₀＝tanγで定義されるが，変形が微小であればtanγ＝γとおくことができ，角度の変化として与えられる)。…

※「normal strain」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報