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On mechanical modeling of composite materials
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH , 2010. , 19 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0494
Identifiers
URN: urn:nbn:se:kth:diva-24644OAI: oai:DiVA.org:kth-24644DiVA: diva2:352393
Public defence
2010-10-01, Sal E3, Osquars backe 14, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20100921

Available from: 2010-09-21 Created: 2010-09-20 Last updated: 2013-01-14Bibliographically approved
List of papers
1. Proper Boundary Conditions for Infinitely Layered Orthotropic Media
Open this publication in new window or tab >>Proper Boundary Conditions for Infinitely Layered Orthotropic Media
2000 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 67, 629-632 p.Article in journal (Refereed) Published
Abstract [en]

A stress analysis of a plane infinitely layered medium subjected to surface loadings is performed using Airy stress functions, integral transforms, and a revised transfer matrix approach. Proper boundary conditions at infinity are for the first time established, which reduces the problem size by one half. Methods and approximations are also presented to enable numerical treatment and to overcome difficulties inherent to such formulations.

Identifiers
urn:nbn:se:kth:diva-24638 (URN)10.1115/1.1309542 (DOI)
Note
QC 20100920Available from: 2010-09-20 Created: 2010-09-20 Last updated: 2010-09-21Bibliographically approved
2. Dynamical Effects on the Burst Size Distribution and Universality in Fiber Bundles
Open this publication in new window or tab >>Dynamical Effects on the Burst Size Distribution and Universality in Fiber Bundles
2001 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2001. 20 p.
Series
Trita-HFL, ISSN 1104-6813 ; 0285
Identifiers
urn:nbn:se:kth:diva-24654 (URN)
Note
QC 20100921Available from: 2010-09-21 Created: 2010-09-21 Last updated: 2010-09-21Bibliographically approved
3. Inertia and damping effects on the damage-dependent burst size distribution of fiber bundles
Open this publication in new window or tab >>Inertia and damping effects on the damage-dependent burst size distribution of fiber bundles
2001 (English)In: Physics Letters A, ISSN 0375-9601, Vol. 290, 261-269 p.Article in journal (Refereed) Published
Abstract [en]

Distributions of simultaneous fiber failures—bursts—in loaded fiber bundles are studied considering inertia and damping. Resulting burst size distributions have universal properties: all approach the power law DΔΔ−2.5 for larger burst sizes Δ. Momentary burst size distributions evolve with increasing damage and do not follow power laws but are still universal. Finally, it is briefly outlined how to use distribution progression to assess damage state.

Keyword
Fiber bundle, Simultaneous failures, Burst, Avalanche, Burst size distribution, Universality, Inertia, Damping
Identifiers
urn:nbn:se:kth:diva-24640 (URN)10.1016/S0375-9601(01)00621-1 (DOI)
Note
QC 20100920Available from: 2010-09-20 Created: 2010-09-20 Last updated: 2010-09-21Bibliographically approved
4. Issues on Viscoplastic Characterization of Lead-Free Solder for Drop Test Simulations
Open this publication in new window or tab >>Issues on Viscoplastic Characterization of Lead-Free Solder for Drop Test Simulations
2010 (English)Report (Other academic)
Abstract [en]

Reliable drop test simulations of electronic packages require reliable material characterization of solder joints. Mechanical properties of lead-free solder were here experimentally investigated for both monotonous and cyclic loading at different strain rates. With regards to the observed complex material behavior, the non-linear mixed hardening Armstrong and Fredrick model combined with the Perzyna viscoplastic law was chosen to fit the experimental data. This model was subsequently implemented into a commercial finite element code and used to simulate drop tests. Actual drop test experiments were conducted in parallel and experimental results were compared to simulations. Prediction discrepancies were analyzed and explanations suggested.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 22 p.
Series
Trita-HFL, ISSN 1104-6813 ; 487
Identifiers
urn:nbn:se:kth:diva-24650 (URN)
Note
QC 20100921Available from: 2010-09-21 Created: 2010-09-21 Last updated: 2010-09-21Bibliographically approved
5. Explicit, Fully Implicit and Forward Gradient Numerical Integration of a Hyperelasto-Viscoplastic Constitutive Model for Amorphous Polymers Undergoing Finite Deformation
Open this publication in new window or tab >>Explicit, Fully Implicit and Forward Gradient Numerical Integration of a Hyperelasto-Viscoplastic Constitutive Model for Amorphous Polymers Undergoing Finite Deformation
2010 (English)Report (Other academic)
Abstract [en]

Following the growing use of amorphous polymers in an expanding range of applications, interest for polymer mechanical modeling has greatly increased. Together with reliable constitutive models, stable, accurate and rapid integration algorithms valid for large deformations need to be developed. Here, in a framework of hyperelasto-viscoplasticity and multiplicative split formulation, three integration algorithms (explicit, fully implicit and forward gradient) are applied to the polymer model developed by Anand and Gurtin (2003) and respective stability is investigated. The explicit and fully implicit algorithms were furthermore implemented in a commercial Finite Element code and simulations of a simple tensile test are shown to capture the actual deformation behavior of polymers.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 24 p.
Series
Trita-HFL, ISSN 1104-6813 ; 0492
Identifiers
urn:nbn:se:kth:diva-24652 (URN)
Note
QC 20100921Available from: 2010-09-21 Created: 2010-09-21 Last updated: 2010-09-21Bibliographically approved
6. Network Modeling of Paper Materials: a Micromechanical Model to Investigate the Influence of Fiber Properties
Open this publication in new window or tab >>Network Modeling of Paper Materials: a Micromechanical Model to Investigate the Influence of Fiber Properties
2010 (English)Report (Other academic)
Abstract [en]

A periodic micromechanical modeling concept that utilizes continuum elements and a representative volume element (RVE) loaded with periodic boundary conditions is proposed to study paper network properties. The RVE has a volume of 1 mm3 and consists of fibers that are perfectly bonded. The fiber properties are represented by an isotropic elastic-plastic model that has an additional hardening effect at large strains, which has been observed for single fibers with high fibril angle. As non-linearities are accounted for in the material model, a fairly small number of elements are needed in the RVE to enable predictions of anisotropic fiber network properties, in this work 10×10 10 elements were used. The model has been used to simulate uniaxial tension tests in the three principal directions (MD, CD and ZD). An anisotropic fiber network structure was generated. With this structure, different deformation mechanisms were activated during loading in the different directions.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 16 p.
Series
Trita-HFL, ISSN 1104-6813 ; 0493
Identifiers
urn:nbn:se:kth:diva-24653 (URN)
Note
QC 20100921Available from: 2010-09-21 Created: 2010-09-21 Last updated: 2010-09-21Bibliographically approved

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