Author
Otto T. Bruhns
Bio: Otto T. Bruhns is an academic researcher from Ruhr University Bochum. The author has contributed to research in topics: Hardening (metallurgy) & Hyperelastic material. The author has an hindex of 28, co-authored 107 publications receiving 2030 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors proposed new Eulerian rate type constitutive models for isotropic finite deformation elastoplasticity with elasticity, including the use of the newly discovered logarithmic stress rate and incorporation of a simple, natural explicit integrable-exactly rate type formulation of general hyperelasticity.
189 citations
TL;DR: In this paper, the authors generalized Hill's theory of bifurcation and stability in solids obeying normality to include a non-associated flow law, and a one-parameter family of linear comparison solids has been found that admits a potential and has the property that if uniqueness is certain for the comparison solid, then instability is precluded for the underlying elastic-plastic solid.
Abstract: In the present paper, Hill's theory of bifurcation and stability in solids obeying normality is generalized to include a non-associated flow law. A one-parameter family of linear comparison solids has been found that admits a potential and has the property that if uniqueness is certain for the comparison solid then bifurcation and instability are precluded for the underlying elastic-plastic solid. The uniqueness criterion derived may be used as a device to determine lower bounds to the magnitudes of primary bifurcation and instability stresses which are ordinarily unknown. A second linear solid is introduced whose constitutive relations have the same form as the elastic-plastic solid “in loading”. The first eigenstate of this solid gives an upper bound to the primary bifurcation state of the underlying elastic-plastic solid. The search for the genuine primary bifurcation state is therefore replaced by a search for upper and lower bounds in the situation when normality fails to hold. The theory is applied to problems of homogeneous stress states.
149 citations
TL;DR: In this article, the viscous and rate dependent behavior of binary, pseudoelastic NiTi is investigated, where the main focus is on the decoupling of thermal and viscous effects on the transformation stress level as the specimen material is subject to heating and cooling due to latent heat generation and absorption during phase transition.
133 citations
TL;DR: In this paper, a thermodynamic finite-strain model describing the pseudoelastic response of shape memory alloys is proposed based on a selfconsistent Eulerian theory of finite deformations using the logarithmic rate.
107 citations
TL;DR: In this paper, a phenomenological finite deformation elastoplasticity theory is proposed by consistently combining the additive decomposition of the stretching D and the multiplicative deformation gradient F.
90 citations
Cited by
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TL;DR: It is found that tumors are rigid because they have a stiff stroma and elevated Rho-dependent cytoskeletal tension that drives focal adhesions, disrupts adherens junctions, perturbs tissue polarity, enhances growth, and hinders lumen formation.
3,553 citations
TL;DR: Reduction of lysyl oxidase-mediated collagen crosslinking prevented MMTV-Neu-induced fibrosis, decreased focal adhesions and PI3K activity, impeded malignancy, and lowered tumor incidence, and data show how collagenCrosslinking can modulate tissue fibrosis and stiffness to force focal adhesion, growth factor signaling and breast malignancies.
3,396 citations
TL;DR: In this article, a set of elastic-plastic constitutive relations that account for the nucleation and growth of micro-voids is used to model the failure of a round tensile test specimen.
2,962 citations
The Catholic University of America1, Icahn School of Medicine at Mount Sinai2, University of Trieste3, GE Healthcare4, Menzies Research Institute5, Siemens6, Hitachi7, Toshiba Medical Systems Corporation8, Philips9, University of Michigan10, University of Massachusetts Medical School11, Cleveland Clinic12, University of Padua13
TL;DR: This technical document is intended to provide definitions, names, abbreviations, formulas, and procedures for calculation of physical quantities derived from speckle tracking echocardiography and thus create a common standard.
Abstract: Recognizing the critical need for standardization in strain imaging, in 2010, the European Association of Echocardiography (now the European Association of Cardiovascular Imaging, EACVI) and the American Society of Echocardiography (ASE) invited technical representatives from all interested vendors to participate in a concerted effort to reduce intervendor variability of strain measurement. As an initial product of the work of the EACVI/ASE/Industry initiative to standardize deformation imaging, we prepared this technical document which is intended to provide definitions, names, abbreviations, formulas, and procedures for calculation of physical quantities derived from speckle tracking echocardiography and thus create a common standard.
1,032 citations
TL;DR: A detailed survey of ongoing methodologies for soft actuators, highlighting approaches suitable for nanometer- to centimeter-scale robotic applications, including both the development of new materials and composites, as well as novel implementations leveraging the unique properties of soft materials.
Abstract: This review comprises a detailed survey of ongoing methodologies for soft actuators, highlighting approaches suitable for nanometer- to centimeter-scale robotic applications. Soft robots present a special design challenge in that their actuation and sensing mechanisms are often highly integrated with the robot body and overall functionality. When less than a centimeter, they belong to an even more special subcategory of robots or devices, in that they often lack on-board power, sensing, computation, and control. Soft, active materials are particularly well suited for this task, with a wide range of stimulants and a number of impressive examples, demonstrating large deformations, high motion complexities, and varied multifunctionality. Recent research includes both the development of new materials and composites, as well as novel implementations leveraging the unique properties of soft materials.
897 citations