Mechanics of Organic, Implant, and Bioinspired Materials

Brown, Eric N.

doi:10.1007/s11340-007-9051-y

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Finally, results are reported for transverse, or interlamellar, shear, in which the z -plane of the simulation was displaced in the x - or y -direction (ε 4 or ε 5 , respectively, in Voigt notation). Experimentally, interlamellar shear modes have been shown to be relatively soft above T g , compared to other modes of amorphous phase deformation such as interlamellar separation and stack rotation. ,, Recent work by Brown and co-workers indicates that, within certain limitations, the full stress–strain response for high density polyethylene (HDPE) in compression obeys a linear time–temperature superposition with a 1 decade increase in strain rate being approximately equivalent to a 10 K drop in temperature. , Even allowing for deformation rates in simulations that are 7–8 orders of magnitude higher than conventional experiment deformation rates, the deformations simulated here should be well above the glass transition.…”

Section: Models and Simulation Methodologymentioning

confidence: 99%

Plastic Deformation of Semicrystalline Polyethylene under Extension, Compression, and Shear Using Molecular Dynamics Simulation

2014

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Plastic deformation of the stack of alternating crystal and amorphous layers typical of semicrystalline polyethylene is studied by molecular dynamics simulation. A previous investigation of the semicrystalline layered stack undergoing isochoric extension is extended here to include several new modes of deformation: isostress extension, isostress compression, and isochoric shear, at 350 K and deformation rates of 5 × 107 and 5 × 106 s–1. The observed stress–strain responses are interpreted in terms of the underlying structural evolution of the material for each mode of deformation. Under tensile deformation, crystallographic slip was observed at low strains (0 < e 3 < 0.08) regardless of deformation rate. Different yield mechanisms were observed for the different deformation rates. To explain the response at intermediate strains (0.08 < e 3 < 0.26), we introduce the concept of “bridging entanglements”, which are temporary, physical bridges between crystal lamellae comprising entanglements involving chain segments belonging to different crystal lamellae. At high strains (e 3 > 0.26), melting and recrystallization were observed at the slower deformation rate, while surface melting and cavitation were observed at the faster deformation rate. Under compressive deformation at the slower deformation rate, crystallographic slip was again observed at low strains. For the faster compressive deformation, an initial period of rapid stress growth at low strain was observed. This initial stress growth then transitions to a process of fine crystallographic slip at a strain of e 3 = −0.005. At intermediate strains under compressive deformation, the release of bridging entanglements is observed for both strain rates. However, no melting or recrystallization phenomena were observed under compression, even at the highest strains simulated (e 3 = −0.33). Under shear deformation, interlamellar slip was observed for both zx and zy shear (strain gradient parallel to stacking direction). Chain segments tend to stretch and align in the shear direction. Interestingly, under shear deformation this semicrystalline polyethylene exhibits transient behavior typical of non-Newtonian fluids.

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Section: Models and Simulation Methodologymentioning

confidence: 99%

Plastic Deformation of Semicrystalline Polyethylene under Extension, Compression, and Shear Using Molecular Dynamics Simulation

2014

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“…In 1997, Veazie et al investigated the viscoelastic behavior of IM7/K3B composite, a high performance thermoplastic material with potential as a future biomedical implant. Over the last decade, there has been a rapid increase in the number of publications centered on materials with biological applications, which was marked by several reviews and editorials on the subject [8,109,110]. In 2002, Brown et al introduced an ingenious bio-inspired polymer composite capable of self-healing to 90% of its original fracture toughness [111] (Fig.…”

Section: Biomaterialsmentioning

confidence: 99%

“…It was evident that our knowledge of complex biomechanical behavior has been driven by the development of new technologies and new biomaterials as well as the novel application of existing techniques. Ultimately, EM has played an important role in the growth of the field by publishing a wide breadth of noteworthy papers, especially in relation to the development of innovative techniques, technologies, and biomaterials [6][7][8][9][10]. Consequently, as the unique challenges of this field became more apparent to the EM community, new scientific innovations have evolved in response.…”

Section: Introductionmentioning

confidence: 99%

The Evolution of the Field of Biomechanics Through the Lens of Experimental Mechanics

Grande-Allen

2010

Exp Mech

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Biomechanics is a young field that entails the study of the mechanical aspects of the life and health sciences. The growth of this field can be attributed to the growth of cutting-edge technologies that enable scientists to investigate the mechanics of life with increasing acuity. Founded in 1961, the journal Experimental Mechanics (EM) has had an important role in the growth and scholarship of the field of biomechanics. From the mid-1960's to mid-1970's, relevant publications in EM focused on characterizing potential bioimplants and exploring the mechanical properties of connective tissues. The next two decades witnessed a clear drop in biomechanics papers in EM, perhaps due to the rise of biomechanics-specific societies and journals that offered a more dedicated audience while EM sought a more varied readership. More recently, there has been a resurgence of biomechanics publications in EM, including 3 recent special issues devoted to the subject. The journal has brought forth an impressive range of biomechanics related papers including cellular and nanoscale studies, characterization of biological tissues and novel biomaterials, and most importantly, the development of novel technologies and devices that are applicable across the entire field. Digital image correlation and digital volume correlation are examples of techniques presented in EM that have been applied to numerous biomechanics problems. Although the field has exhibited exponential growth in the past 15 years, a myriad of scientific questions, especially on the cellular and subcellular level, remain to be answered. EM should cultivate its future role in shaping this exciting field.

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Formation and sorption of trihalomethanes from cross-linked polyethylene pipes following chlorinated water exposure

Cao

Huang

Whelton

2020

Environ. Sci.: Water Res. Technol.

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Mechanics of Organic, Implant, and Bioinspired Materials

Cited by 4 publications

References 13 publications

Plastic Deformation of Semicrystalline Polyethylene under Extension, Compression, and Shear Using Molecular Dynamics Simulation

Plastic Deformation of Semicrystalline Polyethylene under Extension, Compression, and Shear Using Molecular Dynamics Simulation

The Evolution of the Field of Biomechanics Through the Lens of Experimental Mechanics

Formation and sorption of trihalomethanes from cross-linked polyethylene pipes following chlorinated water exposure

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