Pin support: |
(english) In two dimensions, a pin support restrains two translation degrees of freedom but does not restrain rotation. When considering reaction forces, a pin support is usually considered to have two force components: one each about the x and y axes respectively. |
Roller support: |
(english) In two dimensions, a roller support restrains one translation degree of freedom. |
Shear strain: |
(english) Strain measuring the intensity of racking in the material. Shear strain is measured as the change in angle of the corners of a small square of material. |
Shear modulus: |
(english) The ratio of shear stress divided by the corresponding shear strain in a linear elastic material. |
Stiffness: |
(english) This is a general term which may be applied to materials or structures. When a force is applied to a structure, there is a displacement in the direction of the force; stiffness is the ratio of the force divided by the displacement. High stiffness means that a large force produces a small displacement. When discussing the stiffness of a material, the concept is the same, except that stress substitutes for force, and strain substitutes for displacement; see modulus of elasticity. |
Strain: |
(english) The intensity of deformation at a point in an object. See normal strain and shear strain. |
Support: |
(english) A support contributes to keeping a structure in place by restraining one or more degrees of freedom. In a structural model, supports represent boundary entities which are not included in the model itself, e.g., foundations, abutments, or the earth itself. For each restrained translation degree of freedom at a support, there is a corresponding reaction force; for each restrained rotation degree of freedom, there is a reaction moment. |
Yield strain: |
(english) A material deformed beyond its yield strain, no longer exhibits linear elastic behavior. See yield stress. |
Analysis - |
(Software Engineering) a set of activities that attempt to understand and model customer needs and constraintsAnalysis methods - |
Constraints - |
(Software Engineering) an restrictions or limitations placed on requirements or design |