Improved Understanding of Damage Precursors Through Local Mechanical Characterization

2015 ◽  
Author(s):  
Daniel P. Cole ◽  
Ed M. Habtour
Keyword(s):  
Structural Damage ◽  
Mechanical Characterization ◽  
Acrylonitrile Butadiene Styrene ◽  
Mechanical Tests ◽  
Structure Property ◽  
Aerospace Materials ◽  
Force Microscopy ◽  
Structure Property Relationships ◽  
Atomic Force ◽  
Affect Processing

We report on the use of local mechanical characterization techniques for the understanding of structural damage precursors in various material systems. Instrumented indentation and atomic force microscopy (AFM) were used to characterize local damage in: (1) fatigued metallic beams subject to non-linear vibration, (2) individual polymer and glass microfibers, and (3) additive manufactured thermoplastics. Indentation studies of the fatigued metallic beams showed a compliance effect of up to 40% in relatively highly stressed regions. An approved fiber mounting technique allowed for indentation of unmodified surfaces of single microfibers, while AFM modulus maps of the fibers reveal local regions of relative compliance. Local mechanical tests of 3-D printed acrylonitrile butadiene styrene specimens revealed a variation in properties between printed beads and bead-bead interfaces. The nano-/micro-scale techniques developed in the present study provide a framework for understanding how damage precursors may affect processing-structure-property relationships in present and future structural aerospace materials.

Structure–property relationships of aramid fibers via X-ray scattering and atomic force microscopy

2019 ◽  
Vol 54 (8) ◽  
pp. 6668-6683 ◽  
Author(s):  
Michael R. Roenbeck ◽  
Julia Cline ◽  
Vincent Wu ◽  
Mehdi Afshari ◽  
Steve Kellner ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Structure Property ◽  
Aramid Fibers ◽  
X Ray ◽  
Force Microscopy ◽  
Structure Property Relationships ◽  
X Ray Scattering ◽  
Atomic Force ◽  
Ray Scattering

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

scholarly journals Investigating cell mechanics with atomic force microscopy

2015 ◽  
Vol 12 (104) ◽  
pp. 20140970 ◽  
Author(s):  
Kristina Haase ◽  
Andrew E. Pelling
Keyword(s):  
Atomic Force Microscopy ◽  
Cell Mechanics ◽  
Normal Cell ◽  
Mechanical Characterization ◽  
Nonlinear Models ◽  
Single Cells ◽  
Mechanistic Models ◽  
Force Microscopy ◽  
Atomic Force ◽  
Inelastic Responses

Transmission of mechanical force is crucial for normal cell development and functioning. However, the process of mechanotransduction cannot be studied in isolation from cell mechanics. Thus, in order to understand how cells ‘feel’, we must first understand how they deform and recover from physical perturbations. Owing to its versatility, atomic force microscopy (AFM) has become a popular tool to study intrinsic cellular mechanical properties. Used to directly manipulate and examine whole and subcellular reactions, AFM allows for top-down and reconstitutive approaches to mechanical characterization. These studies show that the responses of cells and their components are complex, and largely depend on the magnitude and time scale of loading. In this review, we generally describe the mechanotransductive process through discussion of well-known mechanosensors. We then focus on discussion of recent examples where AFM is used to specifically probe the elastic and inelastic responses of single cells undergoing deformation. We present a brief overview of classical and current models often used to characterize observed cellular phenomena in response to force. Both simple mechanistic models and complex nonlinear models have been used to describe the observed cellular behaviours, however a unifying description of cell mechanics has not yet been resolved.

scholarly journals Mechanical Characterization of Microengineered Epithelial Cysts by Using Atomic Force Microscopy

2017 ◽  
Vol 112 (2) ◽  
pp. 398-409 ◽  
Author(s):  
Yusheng Shen ◽  
Dongshi Guan ◽  
Daniela Serien ◽  
Shoji Takeuchi ◽  
Penger Tong ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Mechanical Characterization ◽  
Force Microscopy ◽  
Atomic Force ◽  
Epithelial Cysts
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