No.
Thermal stress of a body can never be zero.
It is so because for a given body,
Young's modulus of it can't be zero, linear expansivity of it can't be zero and for a given temperature change, also the change in temperature can't be zero.
But for some bodies made of substances like inver, whose thermal expansivity is very very small, the stress is negligible and can be neglected.
When the temperature of a body increases, the stress induced is typically thermal stress, which arises due to the expansion of materials. If the body is constrained and unable to expand freely, this thermal expansion leads to compressive or tensile stresses. The magnitude of the induced stress depends on the material's coefficient of thermal expansion and the temperature change. If the body can expand freely, no thermal stress will develop.
when the temperature of the body is lowered or raised, it contracts or expands accordingly. If this expansion or contraction is prevented, then a stress is produced called thermal stress
Thermal stress ( and strain) arrises at situations, when there are some area with diffrent temperature in the same body. Or at situatiom - one konstruction part restricts thermal expansion ( dilatation ) another part. Or - two parts (f.e. austenit - ferrit steels ) are in welded connection.
The thermal stress equation used to calculate stress induced in a material due to temperature changes is given by: ET where: thermal stress E Young's modulus of the material coefficient of thermal expansion T change in temperature
The thermal stress formula used to calculate the impact of temperature changes on materials is: E T where: is the thermal stress is the coefficient of thermal expansion E is the modulus of elasticity T is the change in temperature
The principle stress is a maximum tension stress in a body where shear stress is zero and it acts on the principle plane. If a body is under both tension and shear then the principle stress is higher than the initial tension stress. You can calculate this and find the principle plane angle using Mohr Circle analysis or equations.
Thermal expansion is the tendency of a substance to change in volume with a change in temperature. Absolute zero is the lowest possible temperature at which a thermodynamic system reaches minimum energy. The concept of thermal expansion can be observed in materials expanding as they are heated, with absolute zero as the point where all thermal motion ceases.
A temperature change causes an expansion or a contraction of materials, some more than others. This is manifested as thermal strain. If the material is constrained however, so that it is not allowed to expand or contract, then a thermal stress must be induced to make the thermal strain equal to zero. So if the material would typically expand some epsilon1 under the given temperature change then a state of stress must be induced that results in a negative epsilon1 which can be accomplished knowing that stress is equal to strain times Young's modulus. There is likely no need to worry about shear strain, since it usually does not occur assuming you are dealing with an isotropic material.
x mcq
Thermal shock is a sudden change in temperature that can cause stress on the body's cells and tissues. When the body is exposed to extreme temperature changes, it can lead to various health issues such as burns, hypothermia, or heat stroke. This can put a strain on the body's ability to regulate its temperature and can potentially result in serious health complications.
Thermal shock in humans is a rapid change in temperature that can stress the body's ability to regulate heat. This can lead to symptoms like dizziness, nausea, and even fainting as the body struggles to adapt to the sudden change. In extreme cases, thermal shock can cause damage to organs and tissues, posing a serious health risk.
zero stress