The absorption of water from selected, constant relative humidity atmospheres by glass-filled or reinforced epoxy resin was studied. Four groups of samples were prepared: unfilled epoxy, epoxy filled with glass microspheres, epoxy reinforced with transverse unidirectional glass fabric, and epoxy reinforced with longitudinal unidirectional glass fabric. The absorption and dimensional change rates were measured and formulated in an exponential expression. From the ratio of relative absorption to relative length change, the “hygro-elastic coefficient” was defined.
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A 1978 study studied this question.
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