What happens to a body's stress if the temperature goes up or down?

[armin11]

What happens to a body's stress if the temperature goes up or down?What are the equations?

 

[Mapes]

Can you be a little more specific? What makes you think anything happens to a body's stress?

(A temperature change generally leads to a change in size; is this what you mean?)

 

[armin11]

Our university professor told us that there are some equations for temperature stress that apply to a body.for example if we restrict 2 ends of a rod and heat it up,rod grows in size but there isn't any room for it to grow so there is temperature stress.What are the equations for these kinds of temperature stress?

 

[Mapes]

This is correct. When a bar is loaded uniaxially, the axial strain is $\epsilon=\sigma/E$. Add thermal strain and you have $\epsilon=\sigma/E+\alpha\Delta T$. Take into account that $\epsilon=0$ when the bar is fixed, and you can calculate the stress due to the constraint.

 

[DeeNos]

I can say that a body's stress can be affected by changes in temperature. When the temperature goes up, the body may experience an increase in stress due to the body's natural response to heat. This can lead to an increase in heart rate, sweating, and other physiological changes that are associated with the body's fight or flight response.

On the other hand, when the temperature goes down, the body may also experience an increase in stress as it tries to maintain its internal temperature. This can lead to shivering, increased muscle tension, and other physical responses to cold temperatures.

The equations involved in this process are complex and can vary depending on the individual's body composition, health status, and environmental factors. However, some basic equations that can be used to explain the body's response to temperature changes include:

1. Heat loss equation: Q = U x A x (T1-T2), where Q represents the amount of heat lost, U is the overall heat transfer coefficient, A is the surface area of the body, and T1 and T2 represent the initial and final temperatures.

2. Heat production equation: H = M x C x (Tb-Ta), where H represents the amount of heat produced, M is the body's mass, C is the specific heat capacity, Tb is the body's temperature, and Ta is the ambient temperature.

These equations help us understand how the body responds to changes in temperature and how it tries to maintain its internal temperature within a narrow range. However, it is important to note that each individual's response to temperature changes may vary and can be influenced by various factors such as age, gender, and overall health.