Blog posts

It is 50 years that people use models of viscoelastic fracture which assume the fracture energy in the process zone is independent on the crack speed. This has been assumed in the cohesive models by Knauss and Schapery and then by the dissipation theory of de gennes and Persson-Brener.  Researchers like to use this model because it is simple.   Unfortunately, it does not work, as we show in adhesion experiments in the recent JMPS paper attached.   We obtain nice results for a broad band power law material, but these results only work at very low speeds.

by Oscar Lopez-Pamies, John E. Dolbow, Gilles A. Francfort, and Chris J. Larsen

Abstract

Dear colleagues,

Universidad Loyola Andalucía (Seville, Spain) is currently offering a postdoc position (2 years) within the “BatCAT” project, at the Department of Engineering. The aim of this project is to develop a multiscale multiphysical simulation framework of the manufacturing process of electrodes, by means of a coupled thermo-diffusive-mechanical numerical model (DEM- or FEM-based).  

Requirements

Position Title:

PhD Research Assistant

School of Aerospace and Mechanical Engineering

University of Oklahoma, Norman Campus

General Description:

Our latest paper is accessible freely for 50 days from this link: https://authors.elsevier.com/a/1jiSx7NHxQiuj

上海交通大学机械与动力工程学院瞿叶高教授课题组，长期从事动力学与控制研究。课题组获得国家自然科学基金杰出青年科学基金、优秀青年科学基金、重大项目课题、重点项目等支持。因科研任务和团队发展需要，现面向海内外公开招聘博士后，从事动力学/固体力学/流体力学基础理论与方法、智能材料与结构、振动与噪声主被动控制等方面研究。
一、研究方向
1. 动力学/固体力学/流体力学理论与方法
2. 智能材料制备及力学性能表征
3. 结构振动、噪声主被动控制
4. 振动及波动操控技术与器件
5. 流致振动噪声分析与控制
6. 振动与声学在生物医学中的交叉研究
二、招聘条件
1. 年龄不超过35周岁，身心健康；
2. 已获得或即将获得力学、机械、仪器、材料、控制、物理等相关专业的博士学位；
3. 具有独立思考和解决问题的能力，诚信踏实的科研作风，良好的沟通协调能力和职业道德，较强的团队合作意识。
三、岗位职责
1. 参与课题组或独立承担科研项目；
2. 协助指导研究生工作和实验室日常管理；
3. 申报国家自然科学青年基金、博士后基金等科研项目。
四、岗位待遇

Dear colleagues,

We invite you to see the preprint of our new paper Lagrangian approach to origami vertex analysis: Kinematics that will appear in Philosophical Transactions of the Royal Society A. Here we show how the Lagrangian approach to origami facilitates the exploitation of symmetry, formulate reduced order compatibility conditions for some symmetric foldings, and obtain analytical expressions for the kinematics of some degree 6 and degree 8 origami vertices.

We are seeking a doctoral student to join the Multiscale Computational Mechanics Laboratory (MCML) at Vanderbilt University beginning either Spring 2025 or Fall 2025. The research areas span multiscale computational geomechanics and computing. Candidates must also have a strong general interest (prior experience is a plus) in computational mathematics, mechanics, modeling and simulation and computer programming. 

The specific research areas as follows:

We are organizing a EUROMECH colloquium on data-driven mechanics and physics of materials, to be held on May 21-23, 2025, in Gothenburg. Topics of interest include (but are not limited to):

- Traditional and physics-enhanced machine learning for surrogate modeling
- Learning and exploiting latent representations of materials behavior
- Image-based machine learning methods
- Data-driven process modeling of materials
- Generative learning for material optimization
- Micromechanics-based data-driven methods for designing materials

In this work, we show that the combination of material quenched disorder (of finite strength/amplitude and correlation length) and a 2D tip-splitting instability (that gives rise to extra fracture surfaces) is at the heart of the spatiotemporal dynamics of cracks in 3D. Specifically, it is shown to account for the widely observed limiting (terminal) velocity of cracks, mirror-mist-hackle sequence of morphological transitions, crack macro-branching and a 3D-to-2D transition, out-of-plane crack front waves and the properties of micro-branches.