Correspondence principles and a generalizedJ integral for large deformation and fracture analysis of viscoelastic media

Schapery, R. A.

doi:10.1007/bf01140837

Cited by 648 publications

(267 citation statements)

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“…onde, w Tref e w são, respectivamente, a frequência na temperatura de referência e a frequência na temperatura em questão, e o parâmetro a T é o fator de translação horizontal (horizontal shift factor) [14]. …”

Section: Módulo De Rigidez Ou Módulo Complexounclassified

Análise teórico-experimental do módulo dinâmico de compósitos asfálticos com argila calcinada

Silva

Frota

2016

Cerâmica

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INTRODUÇÃOO agregado sinterizado de argila calcinada (ASAC) apresenta-se promissor para localidades que apresentam dificuldades na obtenção de materiais pétreos, com vistas à produção de agregado graúdo (brita), e ao mesmo tempo possuem abundância de solos argilosos. Esta é a realidade presente em grandes regiões do Brasil, com destaque na pavimentação asfáltica de rodovias em trechos distantes dos centros urbanos, como são os casos da BR 163 (Santarém, PA -Cuiabá, MT) e BR 319 (Manaus, AM -Porto Velho, RO), situações em que os agregados de argila calcinada se mostram viáveis técnica e economicamente [1-3]. ResumoNa análise mecanicista das misturas asfálticas, o módulo complexo é um parâmetro de importância fundamental para formulação de modelos constitutivos de sua estrutura, pois retrata tanto a parcela do comportamento elástico, decorrente dos agregados, quanto o comportamento viscoso, advindo do ligante asfáltico. A primeira é representada pelo módulo dinâmico e a segunda pelo ângulo de fase. Ambos os parâmetros dependem da temperatura e da frequência de carregamento. Como não é possível medi-los para toda temperatura e carregamento, obtêm-se funções que representem esses parâmetros, utilizando-se tanto ajustes genéricos como modelos de previsão do comportamento. Analisou-se a viabilidade de diversas modelagens referente ao módulo dinâmico de compósitos asfálticos com argila calcinada, obtidos mediante ensaios de flexão a quatro pontos. Observou-se que podem ser utilizados com eficiência tanto regressões múltiplas não lineares quanto as curvas mestras, com translação entre frequência e temperatura. Equações fenomenológicas também podem ser empregadas com precisão, por meio das quais é possível extrapolar os dados, obtendo-se o valor de equilíbrio do módulo dinâmico quando a frequência tende ao infinito. Palavras-chave: mistura asfáltica, módulo dinâmico, argila calcinada, agregado sinterizado de argila calcinada, modelagem matemática. AbstractIn

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Section: Módulo De Rigidez Ou Módulo Complexounclassified

Análise teórico-experimental do módulo dinâmico de compósitos asfálticos com argila calcinada

Silva

Frota

2016

Cerâmica

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“…Instead, a short review of those approaches that treat the pavement as viscoelastic will be discussed. Indeed, most of these appear to fall into one distinct approach in that they are based on a formulation proposed by Schapery for particulate composites (Schapery 1981;1982, 1984a, 1987a,b, 1990a,b, 1994Schapery and Sicking 1995). Briefly, this approach uses a single integral framework in time to account for history and rate dependence, together with a nonlinear strain scale, to construct a nonlinear viscoelastic stress-strain relation at the composite level for asphaltic concrete.…”

Section: Recent Research On Asphaltic Pavementmentioning

confidence: 99%

Method for Performing Accelerated Characterization of Viscoelastic Constitutive Behavior of Asphaltic Concrete

Berthelot

Allen

Searcy

2003

J. Mater. Civ. Eng.

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“…Thus, it is difficult to apply such data to structural components. To account for the time dependence of viscoelastic materials, Schapery [1984] proposed a characterizing parameter, J v , and showed that J v uniquely defines the crack-tip conditions, making it a suitable fracture criterion for a wide range of rate-sensitive materials. By limiting the dependence of the time-shift factor on the stress or by choosing specific power-law forms for the constitutive response, Schapery [1990] further showed that J v is path independent for nonlinearly viscoelastic materials with constitutive equations based on a reduced time, and is a candidate parameter for the characterization of the crack-tip fields.…”

Section: Fracture Mechanics Models For Solid Rocket Propellant Motorsmentioning

confidence: 99%

1997 Summer Research Program (SRP), Summer Research Extension Program (SREP), Final Report, Volume 2. Phillips Laboratory

Moore¹

1997

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REPORT DOCUMENTATION PAGEPubic reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, se the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including sue Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlngton, VA 222024302, and to the Office of Management and Budget, Par. AFRL-SR-BL-TR-00- Gary Moore FUNDING NUMBERS F49620-93-C-0063 PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Research & Development Laboratories (RDL) 5800 Uplander Way Culver City, CA 90230-66088. PERFORMING ORGANIZATION REPORT NUMBER The United States Air Force Summer Research Program (SRP) is designed to introduce university, college, and technical institute faculty members to Air Force research. This is accomplished by the faculty members, graduate students, and high school students being selected on a nationally advertised competitive basis during the summer intersession period to perforn research at Air Force Research Laboratory (AFRL) Technical Directorates and Air Force Air Logistics Centers (ALC). AFOSR also offers its research associates (faculty only) an opportunity, under the Summer Research Extension Program (SREP), to continue their AFOSR-sponsored research at their home institutions through the award of research grants. This volume consists of a listing of the participants for the SREP and the technical report from each participant working at the AF Phillips Laboratory. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air SUBJECT TERMS GENERAL INSTRUCTIONS FOR COMPLETING SF 298The Report Documentation Page (RDP) is used in announcing and cataloging reports. It is important that this information be consistent with the rest of the report, particularly the cover and title page. Instructions for filling in each block of the form follow. It is important to stay within the lines to meet optical scanning requirements. Block 1. Agency Use Only (Leave blank).Block 2. Report Date. Full publication date including day, month, and year, if available (e.g. 1 Jan 88). Must cite at least the year.Block 3. Type of Report and Dates Covered. State whether report is interim, final, etc. If applicable, enter inclusive report dates (e.g. 10Jun87-30Jun88).Block 4. Title and Subtitle. A title is taken from the part of the report that provides the most meaningful and complete information. When a report is prepared in more than one volume, repeat the primary title, add volume number, and include subtitle for the specific volume. On classified documents enter the title classification in parentheses.Block 5. Funding Numbers. To include contract and grant numbers; may include program element number(s), project number(s), task number(s), and work unit number(s). Use the following labels:C -Contract G -Grant PE-Program ElementPR -Project TA -Task WU ■ Work Unit Accession No.Block 6. Author(s). IMame(s) of person(s) responsible for writing the report, performing the rese...

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Correspondence principles and a generalizedJ integral for large deformation and fracture analysis of viscoelastic media

Cited by 648 publications

References 13 publications

Análise teórico-experimental do módulo dinâmico de compósitos asfálticos com argila calcinada

Análise teórico-experimental do módulo dinâmico de compósitos asfálticos com argila calcinada

Method for Performing Accelerated Characterization of Viscoelastic Constitutive Behavior of Asphaltic Concrete

1997 Summer Research Program (SRP), Summer Research Extension Program (SREP), Final Report, Volume 2. Phillips Laboratory

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