Collaborative Research: A Unified Theory of Crack Nucleation and Growth for Materials Subjected to Repetitive Surface Acoustic Waves and Dynamic Impacts

合作研究:重复表面声波和动态冲击下材料裂纹成核和扩展的统一理论

基本信息

项目摘要

Surface acoustic waves (SAWs) are prevalent in many naturally occurring destructive phenomena, such as earthquakes and tsunamis. Further, SAWs have long been speculated to contribute to surface damage produced by cavitation on ship propellers, high-speed impact on wind turbine blades, and fragmentation of rocks by jetting streams. In emerging medical applications, such as Nano-Pulse Lithotripsy, SAWs have also been postulated to play a vital role in ensuring the success of noninvasive disintegration of kidney stones in patients. Despite this, the fundamental mechanisms by which SAWs trigger fracture on the surface of materials remain largely unknown. This is not an isolated phenomenon as the nucleation and propagation of cracks regardless of the loading type has been a vexing problem for decades. In this context, this award supports fundamental research to explain how the repeated application of SAWs and other dynamic loadings can give rise to the nucleation of cracks on the surface of brittle materials and affect their subsequent growth. Insights from this project will significantly benefit scientists and engineers seeking to understand and predict a fundamental phenomenon that has remained elusive: the onset of damage in brittle materials in response to mechanical loads at large. The proposed research is interdisciplinary, bringing together engineers and computational scientists to fully explore this class of problems. Importantly, it also includes outreach activities designed to encourage under-represented minority students in STEM fields at the high school and undergraduate levels to pursue research in mechanics of materials. Despite recent theoretical progress in the field of fracture, the current scientific understanding of crack nucleation and its transition to growth in solids remains incomplete and under-explored. This research is focused on the experimental, theoretical, and computational study of crack nucleation and growth in brittle materials in response to repeated, dynamic loadings under a wide range of conditions. Two prototypical systems will be studied: materials that are submerged and subjected to multiple shock loadings that also cause SAWs, and dry materials that are subjected to repeated impact loads. New experiments will be conducted on both glass and Begostone, an engineered material whose elasticity, strength, and toughness properties can be conveniently varied over a substantial range. The experiments will be carried out in conjunction with simulations based on a new continuum theory that will incorporate inertial effects and low-cycle fatigue into a unified model of crack nucleation and growth. The results of these studies will shed light on the fundamental yet long-unresolved question of how low cycle fatigue and inertial loads can degrade the strength and toughness of material systems and ultimately result in their fracture and failure in response to arbitrary mechanical loads.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
声表面波(SAW)在许多自然发生的破坏性现象中普遍存在,例如地震和海啸。此外,长期以来,人们一直认为SAW会导致船舶螺旋桨上的气穴现象、风力涡轮机叶片上的高速冲击以及喷射流造成的岩石破碎所产生的表面损坏。 在新兴的医疗应用中,如纳米脉冲碎石术,SAW也被认为在确保患者肾结石的非侵入性崩解成功方面发挥着至关重要的作用。 尽管如此,SAW在材料表面上触发断裂的基本机制在很大程度上仍然未知。这不是一个孤立的现象,因为无论载荷类型如何,裂纹的成核和扩展都是几十年来令人烦恼的问题。在这种情况下,该奖项支持基础研究,以解释SAW和其他动态载荷的重复应用如何引起脆性材料表面裂纹的成核并影响其随后的生长。该项目的见解将使寻求理解和预测一个仍然难以捉摸的基本现象的科学家和工程师受益匪浅:脆性材料在机械载荷作用下发生损伤。拟议的研究是跨学科的,将工程师和计算科学家聚集在一起,充分探索这类问题。 重要的是,它还包括旨在鼓励高中和本科阶段STEM领域代表性不足的少数民族学生从事材料力学研究的外联活动。 尽管最近在断裂领域取得了理论进展,但目前对裂纹成核及其在固体中过渡到生长的科学认识仍然不完整,并且未得到充分探索。 本研究的重点是在广泛的条件下,响应于重复的动态载荷的脆性材料中的裂纹成核和生长的实验,理论和计算研究。两个原型系统将被研究:材料被淹没,并受到多重冲击载荷,也会导致SAW,和干燥的材料,受到反复的冲击载荷。新的实验将在玻璃和Begostone上进行,Begostone是一种工程材料,其弹性,强度和韧性特性可以在很大范围内方便地变化。实验将结合基于新的连续理论的模拟进行,该理论将惯性效应和低周疲劳纳入裂纹成核和生长的统一模型。这些研究的结果将揭示基本的,但长期-一个尚未解决的问题,即低周疲劳和惯性载荷如何降低材料系统的强度和韧性,并最终导致其在任意机械载荷下的断裂和失效。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查进行评估,被认为值得支持的搜索.

项目成果

期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Phase-field approaches to fracture in the 3rd millennium
第三个千年的相场断裂方法
  • DOI:
    10.1007/s10704-022-00666-8
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    2.5
  • 作者:
    Lopez-Pamies, Oscar;Bourdin, Blaise
  • 通讯作者:
    Bourdin, Blaise
The revisited phase-field approach to brittle fracture: application to indentation and notch problems
重新审视脆性断裂的相场方法:在压痕和缺口问题中的应用
  • DOI:
    10.1007/s10704-022-00653-z
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    2.5
  • 作者:
    Kumar, A.;Ravi-Chandar, K.;Lopez-Pamies, O.
  • 通讯作者:
    Lopez-Pamies, O.
The Trousers Fracture Test for Viscoelastic Elastomers
粘弹性体裤型断裂试验
  • DOI:
    10.1115/1.4062140
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Shrimali, Bhavesh;Lopez-Pamies, Oscar
  • 通讯作者:
    Lopez-Pamies, Oscar
The strength of the Brazilian fracture test
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Oscar Lopez-Pamies其他文献

The nonlinear elastic deformation of liquid inclusions embedded in elastomers
嵌入弹性体中的液态夹杂物的非线性弹性变形
  • DOI:
    10.1016/j.jmps.2025.106126
  • 发表时间:
    2025-07-01
  • 期刊:
  • 影响因子:
    6.000
  • 作者:
    Oluwadara Moronkeji;Fabio Sozio;Kamalendu Ghosh;Amira Meddeb;Amirhossein Farahani;Zoubeida Ounaies;Ioannis Chasiotis;Oscar Lopez-Pamies
  • 通讯作者:
    Oscar Lopez-Pamies
Classical variational phase-field models cannot predict fracture nucleation
  • DOI:
    10.1016/j.cma.2024.117520
  • 发表时间:
    2025-01-01
  • 期刊:
  • 影响因子:
  • 作者:
    Oscar Lopez-Pamies;John E. Dolbow;Gilles A. Francfort;Christopher J. Larsen
  • 通讯作者:
    Christopher J. Larsen
The poker-chip experiments of synthetic elastomers explained
合成弹性体的筹码实验解释
Liquid Filled Elastomers: From Linearization to Elastic Enhancement
  • DOI:
    10.1007/s00205-024-02064-x
  • 发表时间:
    2024-12-18
  • 期刊:
  • 影响因子:
    2.400
  • 作者:
    Juan Casado-Díaz;Gilles A. Francfort;Oscar Lopez-Pamies;Maria Giovanna Mora
  • 通讯作者:
    Maria Giovanna Mora

Oscar Lopez-Pamies的其他文献

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{{ truncateString('Oscar Lopez-Pamies', 18)}}的其他基金

Brittle Fracture of Dissipative Solids
耗散固体的脆性断裂
  • 批准号:
    2308169
  • 财政年份:
    2023
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
Collaborative Research: Fracture and Healing of Elastomers: An Experimental and Theoretical Investigation at High Spatiotemporal Resolution
合作研究:弹性体的断裂和愈合:高时空分辨率的实验和理论研究
  • 批准号:
    1901583
  • 财政年份:
    2019
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
DMREF: Collaborative Research:Elastomers Filled with Electro- and Magneto-Active Fluid Inclusions: A New Paradigm for Soft Active Materials
DMREF:合作研究:填充电活性和磁活性流体包裹体的弹性体:软活性材料的新范例
  • 批准号:
    1922371
  • 财政年份:
    2019
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
Collaborative Research: Extreme Enhancement of the Electromechanical Properties of Soft Nano-Particulate Composites via Interphases
合作研究:通过界面极大增强软纳米颗粒复合材料的机电性能
  • 批准号:
    1661853
  • 财政年份:
    2017
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
Collaborative Research: Fracture in Soft Organic Solids --- The Variational View
合作研究:软有机固体的断裂——变分观
  • 批准号:
    1615661
  • 财政年份:
    2016
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
EAGER/Collaborative Research: Processing and Characterization of Soft Active Nanoparticulate Composites
EAGER/合作研究:软活性纳米颗粒复合材料的加工和表征
  • 批准号:
    1349535
  • 财政年份:
    2013
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
An Iterated Homogenization Method to Study Cavitation in Soft Solids
研究软固体空化的迭代均化方法
  • 批准号:
    1242089
  • 财政年份:
    2012
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
Collaborative Research: Damage in Soft Solids: Elasticity vs Fracture
合作研究:软固体损伤:弹性与断裂
  • 批准号:
    1235352
  • 财政年份:
    2012
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
CAREER: Novel Homogenization Approaches to Study the Electromechanical Behavior and Stability of Soft Electrostrictive Composites
职业:研究软电致伸缩复合材料机电行为和稳定性的新型均质化方法
  • 批准号:
    1055528
  • 财政年份:
    2011
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant
CAREER: Novel Homogenization Approaches to Study the Electromechanical Behavior and Stability of Soft Electrostrictive Composites
职业:研究软电致伸缩复合材料机电行为和稳定性的新型均质化方法
  • 批准号:
    1219336
  • 财政年份:
    2011
  • 资助金额:
    $ 35.38万
  • 项目类别:
    Standard Grant

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