Querkontraktion
Querkontraktion, also known as transverse contraction or Poisson's effect, is a phenomenon observed in materials subjected to uniaxial stress. When a material is stretched or compressed along one axis, it tends to contract or expand, respectively, in the directions perpendicular to that axis. This change in width or thickness is proportional to the applied stress and is a characteristic property of the material.
The ratio of transverse strain to axial strain is quantified by Poisson's ratio, denoted by the Greek
Materials with a negative Poisson's ratio, known as auxetic materials, exhibit the opposite behavior; they expand
Poisson's effect is a fundamental concept in solid mechanics and plays a crucial role in understanding the