Thermomechanics of Composites under High Temperatures

1. Front Matter

   Pages i-xviii

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2. High-Temperature Environment and Composite Materials

   • Yuriy I. Dimitrienko

   Pages 1-26

3. General Equations of Multiphase Continuum Mechanics for Ablative Composites

   • Yuriy I. Dimitrienko

   Pages 27-52

4. Mathematical Model of Ablative Composites

   • Yuriy I. Dimitrienko

   Pages 53-72

5. Behaviour of Matrices at High Temperatures

   • Yuriy I. Dimitrienko

   Pages 73-108

6. Reinforcing Fibres under High Temperatures

   • Yuriy I. Dimitrienko

   Pages 109-126

7. Unidirectional Composites under High Temperatures

   • Yuriy I. Dimitrienko

   Pages 127-156

8. Textile Ablative Composite Materials

   • Yuriy I. Dimitrienko

   Pages 157-190

9. Composites Reinforced by Dispersed Particles

   • Yuriy I. Dimitrienko

   Pages 191-202

10. Phenomena in Composite Materials Caused by Gradient Heating

    • Yuriy I. Dimitrienko

    Pages 203-222

11. Linear Ablation of Composites

    • Yuriy I. Dimitrienko

    Pages 223-254

12. Thermal Stresses in Composite Structures under High Temperatures

    • Yuriy I. Dimitrienko

    Pages 255-294

13. Mechanics of Composite Thin-Walled Shells under High Temperatures

    • Yuriy I. Dimitrienko

    Pages 295-322

14. Back Matter

    Pages 323-352

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The thermomechanical properties of composites on polymer matrix at high tem­ peratures are essentially different from those at normal temperatures. The main distinctions briefly consist in the following: • at high temperatures there occurs an irreversible variation (degradation) of all mechanical and thermal properties of a material that usually has a complex non-linear character depending on time exposure under high temperature; • there are complicated internal physico-chemical processes in a matrix and fibres under high temperatures called by the general notion of ablation; the internal physico-chemical and mechanical processes run differently in the matrix and fibres, and this leads to the appearance of considerable internal thermal stresses. Generally speaking, a composite under high temperatures can be considered as a multiphase system consisting of solid, gaseous and fluid phases interact.ing mechanically and chemically with each ot.her. There are t.hree levels of temperature: normal, elevated and high. Normal, or room temperatures are 10 - 30°C; elevated temperatures are 30 200°C; hzgh temperatures are those above 200°C. However, the dividing line between elevated and high temperat.ures depends on the material involved; a temperature is called high for a particular composite material if, at this temperature, irreversible internal physico-chemical transformations occur in the matrix and/ or fibres of the material.

• composite
• composite material
• continuum mechanics
• deformation
• modeling

`... well-organized... will be a welcome addition to the literature for those scientists and engineers faced with the challenge of designing advanced composite materials for use at high temperatures.'
AIAA Journal, 38:8 (2000)

• Bauman State Technical University, Moscow, Russia

  Yuriy I. Dimitrienko

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