EK480
Isotropic means the material properties are the same in al directions, and also the loadings are the same in all directions.
EK476
A material is regarded as being tough if it absorbs a large amount of energy in breaking.
EK475
The ductility of a material describes the amount of deformation that precedes fracture.
EK442
Usually, when the yield strength of a material is increased through strain hardening, the ductility of the material is reduced.
EK438
Hardness is a measure of the resistance a material offers to scratching and indention.
EK437
Toughness is the ability of a material to absorb large amounts of energy.
EK315
According to maximum principal stress theory (Rankine’s theory) the failure of material will occur when the maximum principal stress in the complex stress system attains the value of the maximum […]
EK245
The modulus of elasticity is a measure of stiffness, or the resistance of the material to deformation.
EK225
The Euler buckling theory makes no allowance for: Homogeneity of column material. Isotropy of column material. Variation of Young’s modulus and elastic-plastic behaviour of column material. Loading not axial. Residual […]
EK210
It is therefore accepted that 5% of the material in a structure is below the design strength, and that 5% of the applied loads are greater than the design loads. […]
EK209
It is not practical, nor is it economically possible, to design a structure that will never fail. It is always possible that the structure will contain material that is less […]
EK174
The central concepts of limit state design are as follows: All the separate conditions that make the structure unfit for use are taken into account. These are the separate limit […]
EK155
A first order elastic analysis of a rigid -jointed frame is based on the assumptions that: The material behaves linearly, so that all yielding effects are ignored. The members behave […]
EK125
If material strain hardening is not considered in the analysis, a fully yielded cross-section can undergo indefinite rotation at a constant restraining plastic moment.
EK94
There are two main assumptions for first order plastic analysis: The structure is made of ductile material that can undergo large deformations beyond the elastic limit without fracture or buckling. […]
EK68
When the material of a structural component is stressed beyond its elastic limit, the stress will seize to be proportional to the strain, Hooke’s law will no longer apply, and […]
EK57
For an incompressible material Poisson ratio equal 0.
EK53
For any material Poisson ratio is between 0 and 1/2.
EK52
If the body has no abrupt changes in geometry, material properties and external conditions (e.g., load), the body can be divided into equal subdivisions and hence the spacing of the […]
EK49
Elastic buckling is a state of lateral instability that occurs while the material is stressed below the yield point.
EK46
Requirements for the principle of superposition to apply: The material must behave in a linear-elastic manner. The geometry of the structure must not undergo significant change when the loads are […]
EK03
The superposition is not valid when the material stress-strain relationship is non-linear.