Article
Polymer Science
Huaan Luo, Yinlong Zhu, Haifeng Zhao, Luqiang Ma, Jingjing Zhang
Summary: This study models tension tests for a hyperelastic electroactive polymer (EAP) membrane material using finite element method (FEM) and investigates their experimental accuracy. The impact of apparatus structure parameters and specimen dimensions on experimental performances is also analyzed. Additionally, a tensile efficiency is proposed to assess non-uniform deformation in equibiaxial planar tension and radial tension tests.
Article
Nanoscience & Nanotechnology
Qizhen Li
Summary: The study investigated the effect of testing temperature on mechanical properties and deformation mechanisms of fine-grained magnesium samples through tensile testing. The results show that both mechanical properties and deformation mechanisms were significantly affected by the variation of testing temperature, with strength increasing linearly and ductility decreasing linearly with decreasing temperature. The dominating deformation mechanism shifted from tensile twinning at room temperature to negligible twinning and primary dislocation operation at subfreezing temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Na-Hyang Kim, Gyeong-Seok Hwang, Hangeul Kim, Si-Hoon Kim, Jeong-Hyun Woo, Myoung Hoon Song, Ju-Young Kim
Summary: The study demonstrates the enhanced biaxial stretchability of highly impermeable SiO2 encapsulation thin film with wrinkle structures. It is found that the high elastic deformation limit of the SiO2 film helps stabilize the wrinkle structure, and the type of wrinkle structure is determined by the pre-strain method.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Yifan Rao, Shutao Qiao, Zhaohe Dai, Nanshu Lu
Summary: Elastic wetting refers to the phenomenon where micro- or nano-scale droplets are covered by an ultrasoft elastic membrane, with examples including cell blebs and 2D material bubbles. This study investigates the equilibrium of elastic wetting, showing that the pressure across the membrane/droplet interface can be described by a superposition of the Young-Laplace equation and the nonlinear membrane equation. Nonlinear elasticity, geometric nonlinearity, surface tension, and membrane-substrate adhesion combine at the contact line to produce a variety of membrane-confined droplet configurations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Polymer Science
Tereza Vankova, Tomas Kroupa, Robert Zemcik, Jan Krystek, Hana Zemcik
Summary: The presented paper focuses on identifying temperature-dependent parameters for a newly designed material model of 3D-printed PETG. The developed elastic-plastic material model with damage describes the nonlinear behavior of the material. Experimental tests and numerical simulations were conducted to determine the material parameters. This research is significant in understanding and optimizing the performance of 3D-printed PETG materials.
Article
Nanoscience & Nanotechnology
Anna Krapf, David D. Gebhart, Christoph Gammer, Megan J. Cordill, Benoit Merle
Summary: The high-cycle fatigue properties of metallic thin films, especially their relation to creep behavior, were investigated. Cyclic testing on gold thin films showed that the lifetime decreases with increasing stress amplitude and temperature. Strain accumulation is mainly attributed to cyclic creep, and creep becomes more pronounced at higher temperatures. The study suggests that the fatigue lifetime of gold thin films is closely connected to their creep properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
S. Shrikanth, Rajesh Prasad, Kevin M. Knowles
Summary: This article provides formulas for the biaxial moduli and their principal values of single crystal cubic thin films under equibiaxial strain, and investigates the relationship between shear strains and out-of-plane normal strains. The results show that the stationary points of the biaxial modulus lie on specific crystal surface orientations.
Article
Engineering, Mechanical
Fatma Kharrat, Mohamed Khlif, Loic Hilliou, Hedi Nouri, Jose A. Covas, Chedly Bradai, Mohamed Haboussi
Summary: The bulge test is a simple and suitable method to characterize the mechanical properties of plastic films, including PLA and biocomposites filled with DPLF. The analytical approaches and 3D-DIC method were used to predict and measure the bulge radius and dome apex thickness. Comparisons showed good agreement between experimental and analytical results, and the 3D-DIC method also provided accurate strain calculation in tensile testing.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Industrial
Ruiqiang Zhang, Zhutao Shao, Zhusheng Shi, Trevor A. Dean, Jianguo Lin
Summary: The study reviewed existing cruciform specimen designs and proposed three different geometries to investigate fracture initiation locations and strain paths. It was found that Type III specimen has high potential for evaluating formability for sheet metal.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Industrial
A. Boyer, N. Demazel, J. Coer, M. Carin, H. Laurent, M. C. Oliveira
Summary: A novel hydraulic bulge test device was developed to evaluate high temperature biaxial stress-strain curves of quenchable boron steel sheets. The device focuses on ensuring a homogeneous temperature field and is capable of reproducing practical hot stamping conditions. The results indicate challenges in the acquisition of strain fields, strain-rate control, and interpretation of metallurgical evolutions for the evaluation of biaxial flow curves at high temperatures.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Maciej Kulpa, Agnieszka Wiater, Mateusz Rajchel, Tomasz Siwowski
Summary: This study investigates the application of FRP in a novel bridge deck panel through experimental material research, providing an opportunity for customized FRP bridge deck panels. Concurrently using analytical calculations to determine engineering constants and strength parameters, effectively validating the compliance of the experimental results.
Article
Engineering, Mechanical
Pedro R. da Costa, Luis Reis, Diogo Montalvao, Manuel Freitas
Summary: This study presents and validates a new method for ultrasonic fatigue testing of equibiaxial and pure shear cruciform specimens. The experimental results show that this method allows determining the fatigue strength of cruciform specimens in the VHCF regime with very satisfactory results. Three different cruciform geometries were tested in the study.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Karlos Kazinakis, Stelios Kyriakides, Chad M. Landis
Summary: The stress-strain response and inhomogeneous deformation of pseudoelastic NiTi tubes under combined axial force and internal pressure are influenced by tension/compression asymmetry and anisotropy. The analysis captures the level of transformation stresses and the extent of axial strain when both asymmetry and anisotropy are considered, but slightly overestimates the hoop strain. In the absence of anisotropy, the tube deforms uniformly with coincident stress-average strain hysteresis. When calibrated to the partially unstable uniaxial tensile response, the analysis predicts coincident stress-average strain hysteresis with lower stress plateaus and strongly inhomogeneous deformation.
EXTREME MECHANICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Z. Wang, D. Guines, X. Chu, L. Leotoing
Summary: This study constructs the forming limit curve (FLC) of AA6061-T4 sheets using in-plane biaxial tensile tests with two distinct cruciform specimens, covering a wider range of strain paths. Four different necking detection methods are investigated and proper ones are selected based on finite element modeling and the Marciniak test. An anisotropic Gurson-Tvergaard-Needleman (GTN) plasticity model is calibrated and implemented to reproduce the behavior of AA6061-T4 sheets. The predicted FLCs show good agreement with the experiments, indicating the effectiveness of the numerical biaxial tensile test combined with the anisotropic GTN plasticity model for predicting sheet metal formability.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Lubica Mikova, Erik Prada, Michal Kelemen, Vaclav Krys, Roman Mykhailyshyn, Peter Jan Sincak, Tomas Merva, Lukas Lestach
Summary: This article discusses the modernization of a loading system for analyzing elastic-plastic properties of sheet metals in plane stress. The importance of identifying the onset of plastic deformation in sheet metals for cold pressing and load capacity assessment is highlighted. The design of the hydraulic control structure and computer simulations were used to automate the experimental evaluation process and verify the functionality and correctness of the proposed models.
Article
Computer Science, Information Systems
Stefan E. Schausberger, Rainer Kaltseis, Michael Drack, Umut D. Cakmak, Zoltan Major, Siegfried Bauer
Article
Chemistry, Multidisciplinary
Richard Moser, Gerald Kettlgruber, Christian M. Siket, Michael Drack, Ingrid M. Graz, Umut Cakmak, Zoltan Major, Martin Kaltenbrunner, Siegfried Bauer
Article
Materials Science, Multidisciplinary
U. D. Cakmak, Z. Major
EXPERIMENTAL MECHANICS
(2014)
Article
Polymer Science
U. D. Cakmak, G. Grestenberger, Z. Major
EXPRESS POLYMER LETTERS
(2011)
Article
Polymer Science
E. Leiss-Holzinger, U. D. Cakmak, B. Heise, J. -L. Bouchot, E. P. Klement, M. Leitner, D. Stifter, Z. Major
EXPRESS POLYMER LETTERS
(2012)
Article
Mechanics
Umut D. Cakmak, Thomas Schoeberl, Zoltan Major
Article
Mechanics
U. D. Cakmak, F. Hiptmair, Z. Major
MECHANICS OF TIME-DEPENDENT MATERIALS
(2014)
Article
Polymer Science
Umut D. Cakmak, Michael Fischlschweiger, Ingrid Graz, Zoltan Major
Article
Engineering, Mechanical
Thomas Zehetbauer, Andreas Plockinger, Carina Emminger, Umut D. Cakmak
Summary: This paper presents a peristaltic pump design that uses a wobbling plate to transport fluid, contracting and unloading the soft layer to achieve low pressure fluid transport. The design methodology includes analytical calculations, numerical calculations, and experimental validations.
Article
Chemistry, Physical
Carina Emminger, Umut D. Cakmak, Rene Preuer, Ingrid Graz, Zoltan Major
Summary: This study examined the damping behavior of various elastomeric materials and compared the performance of thermoplastic polyurethane and silicone rubber blends. By characterizing the materials and conducting experimental validations, the reliability of the methodology for determining material parameters and making realistic predictions was demonstrated. Interestingly, the rebound resilience of a mixture of soft and hard polydimethylsiloxane was found to be the highest, while thermoplastic polyurethane exhibited the lowest values.
Article
Engineering, Multidisciplinary
Philipp S. Stelzer, Umut Cakmak, Lisa Eisner, Leonhard K. Doppelbauer, Imre Kallai, Gernot Schweizer, Heinz K. Prammer, Zoltan Major
Summary: Compression molding of carbon fiber sheet molding compounds (CF-SMC) is a promising technology for reducing waste and promoting sustainable development in lightweight applications. This study focuses on a structural automotive component and develops a cost-efficient, large-scale compression molding process. The process-structure-property-performance relationship is characterized through manufacturing studies and prototype tests. The combination of virgin and recycled carbon fiber materials in a multilayered hybrid structure maintains manufacturability and mechanical performance. Life cycle assessment shows lower environmental impacts compared to an industrially used aluminum reference version. The compression molding technology combined with multilayered hybrid carbon fiber composites offers opportunities for circularity and the multistage use of industrial recyclates in lightweight applications.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Biomedical
Umut D. Cakmak, Zoltan Major, Michael Fischlschweiger
Summary: This study experimentally investigated the dynamic thermomechanical behavior of temperature-triggered phase transforming NiTi shape memory alloy wires with different chemical compositions and geometries under force-controlled conditions. Contrary trends were observed in the storage modulus and mechanical loss factor at different temperatures and loading frequencies, providing valuable insights for modeling the behavior of rehabilitation devices.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2021)
Article
Chemistry, Physical
Umut D. Cakmak, Ingrid Graz, Richard Moser, Michael Fischlschweiger, Zoltan Major
Proceedings Paper
Engineering, Mechanical
Florian Dirisamer, Umut Cakmak, Edmund Marth, Zoltan Major
XIVTH YOUTH SYMPOSIUM ON EXPERIMENTAL SOLID MECHANICS
(2016)
