Module 3.4 Flashcards
What is Brittle?
A brittle object is one that shows very little stain before reaching its breaking stress.
What is Compression?
The result of two coplanar forces acting into an object. Compression usually results in a reduction in the length of the object.
What is Compressive Deformation.
The changing of an object’s shape due to compressive forces.
What is Ductile?
A material is ductile if it can undergo very large extensions without failure. Ductile materials can be stretched into wires.
What is Elastic Deformation?
If a material deforms with elastic behavior, it will return to its original shape when the deforming forces are removed. The object will not be permanently deformed.
What is Elastic Potential energy?
The energy stored in an object when it is stretched. It is equal to the work done to stretch the object and can be determined under a force-extension graph.
What is Extension?
The increase of an object’s length.
What is Force-Extension Graph?
A plot showing how an object extends as the force applied increases. For an elastic object, the gradient should be linear up to the limit of proportionality. The gradient gives the spring constant.
What is Hooke’s law?
The extension of an elastic object will be directly proportional to the force applied to it up to the object’s limit of proportionality.
What is Plastic Deformation?
If a material deforms with plastic behavior, it will not return to its original shape when the deforming forces are removed. The object will be permanently deformed.
What is Polymeric?
A material made from polymerys.
What is Spring Constant?
The constant of proportionality for the extension of a spring under a force. The higher the spring constant, the greater the force needed to achieve a given extension.
What is Strain?
The ratio of an object’s extension to its original length. It is a ratio of two lengths and so has no units.
What is Stress?
The amount of force acting per unit area. Its unit is the Pascal (Pa)
What is Tensile Deformation?
The changing of an object’s shape due to tensile forces.
