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相关概念视频

Plastic Behavior01:21

Plastic Behavior

196
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
196
Plastic Deformations01:14

Plastic Deformations

86
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
86
Plasticity00:58

Plasticity

2.1K
Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
2.1K
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

87
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
87
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

264
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
264
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

94
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
94

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Updated: Jun 24, 2025

Building Finite Element Models to Investigate Zebrafish Jaw Biomechanics
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功能模块化和机械应力塑造了鱼类发育过程中的塑性反应.

Leandro Lofeu1, Felipe Montefeltro2, Monique Nouailhetas Simon3

  • 1Laboratório de Evolução e Biologia Integrativa, Departamento de Biologia - FFCLRP, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.

Evolution; international journal of organic evolution
|June 6, 2024
PubMed
概括
此摘要是机器生成的。

环境变化引发了鱼类中的适应性塑料表型. 在Megaleporinus macrocephalus中操纵食条件揭示了骨模块化,生物力学和基因表达 (bmp4) 如何相互作用,形成新的复杂表型.

关键词:
发展性可塑性 发展性可塑性有限元分析是有限元分析.这是模块化的模块化.头骨 头骨头 头骨 头骨 头骨 头骨 头骨

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科学领域:

  • 发育生物学是发展生物学.
  • 进化生物学是进化的生物学.
  • 生态形态学 生态形态学

背景情况:

  • 现型可塑性对于适应至关重要.
  • 了解可塑性的多层次机制对于进化见解至关重要.

研究的目的:

  • 研究如何改变发育条件影响骨模块化,生物力学和Megaleporinus macrocephalus中的基因表达.
  • 探索功能形态,机械应力和分子途径在产生适应性表型之间的相互作用.

主要方法:

  • 操纵与Megaleporinus macrocephalus的食模式相关的发展条件.
  • 骨的功能模块化的分析.
  • 用有限元建模来评估骨的生物机械性质.
  • 测量骨形态遗传蛋白4 (bmp4) 表达水平.

主要成果:

  • 在骨中发现新的功能模块,特别是在实验小组中.
  • 有证据表明,头骨元素与口腔形状变化相关的融合增加.
  • 机械应力大小和在骨内定位的差异.
  • 特定骨分组,口腔位置变化和机械负荷反应之间的相关性.
  • 与生物力学反应和塑料形态型相关的bmp4表达水平的变化.

结论:

  • 发育性可塑性涉及跨多个生物层面的综合反应.
  • 功能模块化和生物机械性质是适应性表型进化的关键组成部分.
  • 分子信号通路,如bmp4,与生物力学适应有关.
  • 这项研究为推动复杂表型进化的表观遗传因素提供了多层次的视角.