The paper presents laser holography and photoelastic image methods for studying local stress conditions inside materials especially composite materials. A new experimental method was presented to obtain isochromatics (σ
1-σ
2) in photoelasticity and isopachics (σ
1+σ
2) in holographic interferometry, which allows easy separation of principal stress σ
1, σ
2. The proposed method was applied to quantitative evaluation both in epoxy materials and in glass fiber-reinforced epoxy composites. The effect of a single fiber on the principal stress distribution in the epoxy was studied.
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