What is the difference between compression and stress in gland packing?
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Compression and stress are two different aspects of gland packing. Compression refers to the act of applying pressure to the packing material in order to prevent fluid leakage . It involves compressing the packing base material in the axial direction, folding it in the packing axial direction . On the other hand, stress in gland packing refers to the relaxation behavior of the packings over time . The tightening pressure of gland packings decreases with time due to stress relaxation . A viscoelastic model is used to describe the stress relaxation of packings, which can simulate the stress response of packings during repeated tightening operations . Therefore, compression is the initial application of pressure to the packing material, while stress refers to the relaxation of that pressure over time.
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