Polymer yield criterion
The Drucker–Prager yield criterion is a pressure-dependent model for determining whether a material has failed or undergone plastic yielding. The criterion was introduced to deal with the plastic deformation of soils. It and its many variants have been applied to rock, concrete, polymers, foams, and other … See more The Drucker–Prager model can be written in terms of the principal stresses as If $${\displaystyle \sigma _{t}}$$ is the yield stress in uniaxial tension, the Drucker–Prager … See more The Drucker–Prager model has been used to model polymers such as polyoxymethylene and polypropylene . For polyoxymethylene … See more The Drucker–Prager criterion can also be expressed in the alternative form Deshpande–Fleck yield criterion or isotropic foam yield criterion The Deshpande–Fleck yield criterion for foams has the form … See more An anisotropic version of the Drucker yield criterion is the Cazacu–Barlat (CZ) yield criterion which has the form See more For foams, the GAZT model uses where $${\displaystyle \sigma _{y}}$$ is a critical stress for … See more An anisotropic form of the Drucker–Prager yield criterion is the Liu–Huang–Stout yield criterion. This yield criterion is an extension of the generalized Hill yield criterion and has the form The coefficients See more WebNumerical modeling of uneven thermoplastic polymers behaviour using experimental stress-strain data and pressure dependent von Mises yield criteria to improve design practices. ScienceDirect 1 de outubro de 2011 Idiomas English ...
Polymer yield criterion
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WebThe Bresler-Pister yield criterion is a function that was originally devised to predict the strength of concrete under multiaxial stress states. ... (2003), Development of experimental method to characterize pressure-dependent yield criteria for polymeric foams. Polymer Testing, vol. 22, no. 2, pp. 197-202. http://www.polymerdatabase.com/polymer%20physics/Craze-Yield%20Behavior.html
WebThree major conclusions were achieved: (1) the yield surfaces generated from the nanoscale model for different temperatures agree well with the paraboloid yield criterion, supporting previous macroscopic experimental observations; (2) rescaling of the entire yield surfaces to the quasi-static case is possible by considering Argon's theoretical predictions for pure … WebAug 8, 2024 · combinations and characterized the yield of various samples under quasi-static loading. In summary, there are limited experimental data on the compression-shear loading paths of polymers represented by PP. Additionally, the applicability of yield criteria and the evolution law of yield surfaces of polymers in a complex stress state remain …
Web31 Dec 1966 - Journal of Polymer Science Part C: Polymer Symposia. Abstract: A yield criterion is constructed for glassy polymers from results of constant strain-rate tests in different stress fields. A significant effect of hydrostatic pressure (or volume change) on the yield stress of polystyrene was found. Webthe physics of yield in amorphous polymers and provide quantitative information and guidance for physics-based yield criteria for polymer-matrix composite materials. Keywords: glassy polymer, molecular dynamics, PMMA, thermoplastic, mechanical properties. I. INTRODUCTION Understanding the molecular origins of the mechanical response of …
WebThe disclosure provides a process to produce a polypropylene composition remarkable in that it comprises providing from 30 to 75 wt.% of a component A based on the total weight of the composition, the component A being one or more propylene homopolymer resins; providing from 25 to 70 wt.% of a component B based on the total weight of the …
WebNov 1, 1981 · 4th International Conference: Deformation, Yield and Fracture of Polymers, Churchill College, Cambridge (1979), p.37 ciprofloxacin for perichondritisWebThe anisotropic yield criterion first posed by Hill has been modified to account for differences in tensile and compressive yield strengths in a given direction; additionally, … dialysis nclexWebMar 9, 2024 · Von Mises stress is a value used to determine if a given material will yield or fracture. It is mostly used for ductile materials, such as metals. The von Mises yield criterion states that if the von Mises stress of a material under load is equal to or greater than the yield limit of the same material under simple tension then the material will ... dialysis mwcoWebSynthesis and characteristics of the polymer. PEG-PCL-PEI synthesis is depicted in Figure 1A. The structure of polymers was confirmed by 1 H-NMR. Based on three protons in methoxy polyethylene glycol, the molecular weight of PEG-PCL was 7.7 kD (2,000 + 100/2 × 114 = 7,700). 1 H-NMR of PEG-PCL-COCHCH 2 is shown in Figure 1C. ciprofloxacin for urethritisWebApr 25, 2001 · The relationship between macroscopic shear yield criteria and local stress distributions in deformed polymer glasses is investigated via molecular dynamics simulations on different scales of coarse-graining and finds that the pmvM criterion only predicts local yield events when stress and displacements are averaged over at least 100 … ciprofloxacin for my dogWebYield criterion applies only to materials that are in the annealed condition. It is known that, when a material is previously deformed by, for instance, rolling, its yield stress increases due to work-hardening. (See Chapter 6.) The term flow stress is usually reserved for the onset of plastic flow in a previously deformed material. dialysis nausea treatmentWebMaterials Engineering Ph.D. candidate at McGill University with expected graduation in 2024. Engineering Researcher: - Expertise in modeling and programming developed through research and work experience - Attention to details, critical analysis, and communication developed through supervising engineering projects and providing … dialysis nausea and vomiting