I understand the basic definitions of creep and pressure relaxation. However, I am confused about the exact difference between them.
See attached photo.
Because a compression force is applied, it will cause a strain.
However, at the same time, the constant compression force also produce a constant strain.
On the other hand, if a constant strain state needs to be achieved, a constant compression force needs to be applied at both ends.
How do you know which one is changing? If strain is changing, it is creep. If force or stress is changing, it is stress relaxation.
Creep deformation and stress relaxation deformation are two time-dependent mechanical behaviors observed in materials under stress. Although they may seem similar, they involve opposite changes in the key parameters: stress and strain. Creep deformation occurs when a constant stress is applied to a material, causing it to slowly deform (strain) over time. This phenomenon is commonly observed in materials like metals and polymers at elevated temperatures. In contrast, stress relaxation describes the situation where a constant strain is applied to a material, but the stress required to maintain that strain decreases over time. This occurs because the material's internal structure rearranges to accommodate the imposed deformation, reducing the resistance to the applied strain.
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