Characterization of distribution of residual stress in shot-peened layer of nickel-based single crystal superalloy DD6 by nanoindentation technique

A study of effect factors on thermal drift rates during cryogenic indentation via Taguchi design and finite element method

Simulation analysis of the deformation behavior of nanoindentation based on elasto–plastic constitutive model

Nanomechanical definition of the properties of composite specimens based on polylactic acid (PLA) was made in the present study. Research activities with accent on biodegradable polymer nanocomposites have fundamental significance originated from the worldwide plastic waste pollution. To receive hybrid nanocomposites with high level of homogeneity, the low cost and environmentally friendly melt extrusion method has been applied. The role of graphene nanoplatelets (GNPs) and multiwall carbon nanotubes (MWCNTs) as reinforcing nanoparticles dispersed in the polymer matrix was thoroughly investigated. Quasi-static nanoindentation analysis was enriched by performance of accelerated property mapping and nanodynamic mechanical testing in order to fully describe the nanoscale surface homogeneity and stress relaxation behavior of the nanocomposite specimens. That novelty of the research approach had a well-marked contribution over the detection of the new samples’ nanomechanical features as a function of the type of carbon nanofiller. Refined nanoscratch experiments uncovered the resistance of the materials against notches by means of measurement of the coefficient of friction and accurate estimation of the residual penetration depth.

https://www.mdpi.com/2079-4991/12/4/709/pdf?version=1645430552

Advanced Nanomechanical Characterization of Biopolymer Films Containing GNPs and MWCNTs in Hybrid Composite Structure

Determining the constitutive behavior of nonlinear visco-elastic-plastic PMMA thin films using nanoindentation and finite element simulation

The invention discloses a method for preparing a flame-retarding and smoke-suppressing carbon fiber reinforced PET composite material, and belongs to a functionalized polyester production technology.A PET resin pellet is selected as a matrix, a PP resin is used as a modifying matrix, the PET and PP are pretreated through a blending process before being blended in order to improve the viscosity ofthe PET pellet and the mechanical properties of the PP, a flame retardant and other ingredients are added into a mixer, all above materials are mixed, the obtained mixture goes through a twin-screw extruder to prepare finished alloy pellets, and the finished alloy pellets are compounded with a carbon fiber reinforcing phase to prepare the composite material. The composite material has higher performances than every single phase, and also has the advantages of good flame retardancy, good smoke suppression effect, low cost, effectiveness in solving the problem of environmental pollution, resource saving, cost reduction, and good social and economic benefits.

Method for preparing flame-retarding and smoke-suppressing carbon fiber reinforced PET composite material

The invention discloses highly-flame-retardant fiber prepared by utilizing waste polyester fabric. The highly-flame-retardant fiber comprises, by weight, 80-90 parts of the waste polyester fabric, 5-8parts of chain extender, 0.1-0.2 part of whitening agent, 5-15 parts of flame-retardant masterbatch and 0.3-0.8 part of antioxidant. The highly-flame-retardant fiber has the advantages that mechanical performance of regenerated polyester fiber is greatly improved by adding a proper amount of the chain extender, and the highly-flame-retardant fiber is high in toughness, whiteness, surface glossiness and flame-retardant efficiency and obvious in condensed phase flame-retardant effect; recycling is realized, production cost is lowered, and no other pollution is caused in the whole production process.

Highly-flame-retardant fiber prepared by utilizing waste polyester fabric and preparation method thereof

The invention discloses hybrid fiber-enhanced r-PET engineering plastic and a production method thereof. The hybrid fiber-enhanced r-PET engineering plastic comprises the following components in partsby weight: 30-50 parts of recovered polyethylene terephthalate, 16-40 parts of polybutylene terephthalate, 20-30 parts of hybrid fibers, 5-15 parts of calcium silicate, 5-15 parts of silicone oil, 0.5-3 parts of a coupling agent, 0.2-1 part of a chain extender, 0.4-1.2 parts of an antioxidant and 0.5-2 parts of a compatilizer. The hybrid fiber-enhanced r-PET engineering plastic has the beneficialeffects that the phenomenon of floating fibers is obviously improved, and the tenacity is good; the product is high in flame retardant efficiency, and has an obvious smoke suppression effect; by adding an appropriate amount of the hybrid fibers, the various mechanical performance of the product is greatly boosted; by adopting a plastic alloy modification method, the high-performance material is obtained, and the performance of a single plastic material is improved and increased; and reasonable resource utilization and cost reduction are achieved.

Chen Jialian

Papers

Determining the constitutive behavior of nonlinear visco-elastic-plastic PMMA thin films using nanoindentation and finite element simulation

Method for preparing flame-retarding and smoke-suppressing carbon fiber reinforced PET composite material

Highly-flame-retardant fiber prepared by utilizing waste polyester fabric and preparation method thereof

Hybrid fiber-enhanced r-PET engineering plastic and production method thereof