Mechanical properties of polymers, composites-Nielsen 2010 Part 7 docx

... Inc. Cottrell, A.H. (19 57) The Properties of Materials at High Rates of Strain. Institute of Mechanical Engineering, London, UK. Courtney, T.H. (1990) Mechanical Behavior of Materials, John Wiley, ... John Wiley, New York. Frenkel, J. (1926) Z Phys. vol. 37, p 572 . Gilman, J.J. and Johnston, W.G. (19 57) Dislocations and Mechanical Properties of Crystals. In: J.C. Fisher...

Ngày tải lên: 11/08/2014, 15:20

... area (1.28 cm diameter) (%) 70 75 -T6 505 570 11 — 70 75 -T73 415 505 11 — 71 78 -T6 540 605 11 — Plastics ACBS Medium impact — 46 6–14 — Acetal Homopolymer — 69 25 75 — Poly(tetra fluorethylene) ... Inc. 5.2PHYSICALBASISFORPLASTICITY 5.2.1PlasticityinCeramics Mostceramicsonlyundergoonlyelasticdeformationpriortotheonsetof catastrophicfailureatroomtemperature.Hence,mostreportsonthe mechanic...

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... Nz=ðhzL), we may rewrite Eq. (7. 6) as  ¼ X h i¼1 bx i N 7: 7Þ Assuming that the average displacement of each dislocation is x, Eq. (7. 7) may now be written as  ¼ b x 7: 8Þ The shear strain rate, _ , ... Inc. partialdislocationsisconfinedtoplanescontainingthestackingfaults, materialswithlowerstackingfaultenergies(wideseparationsofpartials) tendtoexhibithigherlevelsofstrainhardening(...

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... The mechanical properties of compatible blends resemble those of random copolymers, having a single T^ value and modulus tran- sition zone. T K varies rather regularly with composition, often ... effect of any change in £ ()jr Copolymers and plasticized materials often show another effect—a broadening of the transition region with a decrease in the slope of the modulus curve in...

Ngày tải lên: 12/08/2014, 03:20

Ngày tải lên: 11/08/2014, 15:20

... theory 2 97 IK. Theories of Yielding and Cold- Drawing 299 IV. Impact Strength and Tearing 3 07 A. Nature of impact tesfs 3 07 B. Effect of notched 308 C. Effects of temperature 310 D. Effects of orientation ... Effect of hydrostatic pressure 2t?3 H. Effect of molecular weight and branching 265 I. Effect of cross-linking 268 J. Relationships and inlcraclJQrtS 277 K. Effect...

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... tests, a number of general reference books have been published on testing and on the mechanical properties of poly- mers and viscoelastic materials (2 -7) . Unfortunately, a great variety of units ... types of apparatus arc capable of covering the range from a small . fraction of a cycle per second up to millions of cycles per second. Most instruments measure either shea...

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... Kupluil. Kolloitl '/ 1 57. 27 ( 113. E. Ho urul T. Iliilakfyamn. 7. Polymer Sn. [Phyx,). 12. 1 477 (1 974 ). 114. W, O, Slran.nK 7. puiymei .SV/ CZO. I I 7 ( 1 % 7 ) . . 115. Ci. (iec, P, ... Behavior of High Polymers. Intersaence, New York. 1948. 3. J I), Ferry. Viscoelastic properties of Polymers, 3rd ed., Wiley. New York, 1980. 4. I , n, Nielsen. Mechanical Pr...

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... the dimensional stability of a material, and because the tests can be of long duration, such tests are of great practical importance. Creep measurements, especially, are of interest to engineers ... creep of rigid materials, the difficulty arises from the ne- cessity to measure accurately very small deformations and deformation rates. In the case of the stress relaxation of rigi...

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... make reptation difficult. , IX. EFFECT OF PLASTICIZERS ON MELT VISCOSITY Plasticizer or liquid diluents greatly reduce the melt viscosity of polymers (28. 170 - 177 ). Small amounts of liquids at temperatures ... (1 67) . Bueche (163) has attempted to explain theoreti- cally the effect of branching on viscosity. The important factor is the ratio of the mean-square radius of the br...

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