PMID- 32570766
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200928
IS  - 2073-4360 (Electronic)
IS  - 2073-4360 (Linking)
VI  - 12
IP  - 6
DP  - 2020 Jun 18
TI  - Characterization and Model Validation for Large Format Chopped Fiber, Foamed, 
      Composite Structures Made from Recycled Olefin Based Polymers.
LID - 10.3390/polym12061371 [doi]
LID - 1371
AB  - The purpose of this research is to predict the material performance of large 
      format foamed core composite structures, such as crossties or structural timbers, 
      using only constitutive properties. These structures are fabricated from recycled 
      post-consumer/post-industrial waste composed of High-Density Polyethylene (HDPE) 
      and Glass Filled Polypropylene (GFPP). A technical challenge in predicting the 
      final part performance is the mathematical correlation between the 
      microstructural variations and the macroscopic responses as a function of fiber 
      aspect ratio, cell density, and constitutive properties of the polymer blend. The 
      structures investigated have a dense and consolidated outer shell and a closed 
      cell foamed core. The non-linear shell and the foamed core material properties 
      are analyzed with micromechanics models, and the reference stress of the shell 
      and core is predicted using a modified Rule of Mixtures model. The predicted 
      properties are used as the inputs for a Finite Element Analysis (FEA) model, and 
      the computational results are compared to experimental four-point bend test 
      results for sixteen samples performed on a 120-kip compression stage. The results 
      show that the mean of the characterized deflections from the four-point bend 
      tests did not show any variations for an isotropic and transversely isotropic 
      model using a linear analysis. This model was then extended to a non-linear 
      analysis using the Ramberg-Osgood model to predict the full crosstie four-point 
      bend test behavior. The FEA model results show a deviation of 2.45 kN compared to 
      the experimental variation of 3.58 kN between the samples measured.
FAU - Pulipati, Daniel P
AU  - Pulipati DP
AUID- ORCID: 0000-0002-6265-3352
AD  - Department of Mechanical Engineering, Baylor University, Waco, TX 76706, USA.
FAU - Jack, David A
AU  - Jack DA
AUID- ORCID: 0000-0001-7199-0556
AD  - Department of Mechanical Engineering, Baylor University, Waco, TX 76706, USA.
LA  - eng
GR  - Contract Issued to Baylor University, 2017/Axion Structural Innovations/
PT  - Journal Article
DEP - 20200618
PL  - Switzerland
TA  - Polymers (Basel)
JT  - Polymers
JID - 101545357
PMC - PMC7361956
OTO - NOTNLM
OT  - foams
OT  - micro-mechanics
OT  - modeling
OT  - polyolefins
OT  - recycling
OT  - structure-property relations
COIS- The authors declare no conflict of interest.
EDAT- 2020/06/24 06:00
MHDA- 2020/06/24 06:01
PMCR- 2020/06/18
CRDT- 2020/06/24 06:00
PHST- 2020/06/01 00:00 [received]
PHST- 2020/06/12 00:00 [revised]
PHST- 2020/06/14 00:00 [accepted]
PHST- 2020/06/24 06:00 [entrez]
PHST- 2020/06/24 06:00 [pubmed]
PHST- 2020/06/24 06:01 [medline]
PHST- 2020/06/18 00:00 [pmc-release]
AID - polym12061371 [pii]
AID - polymers-12-01371 [pii]
AID - 10.3390/polym12061371 [doi]
PST - epublish
SO  - Polymers (Basel). 2020 Jun 18;12(6):1371. doi: 10.3390/polym12061371.