Strain Distribution and Load Transfer in the Polymer-Wood Particle Bond in Wood Plastic Composites
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1 Strain Distribution and Load Transfer in the Polymer-Wood Particle Bond in Wood Plastic Composites Matthew J. Schwarzkopf Lech Muszyński John Nairn Department of Wood Science and Engineering, Oregon State University, Corvallis, OR
2 Es, (MPa) UTS, (MPa) Do we understand these results? Secant Modulus ASTM D638 Ultimate Tensile Stress ASTM D ,000 2,500 2, , , PF WJ FT UW HDPE Loading Ratio, (kg/kg) 5 PF WJ FT UW HDPE Loading Ratio, (kg/kg) Source: Karas, M
3 Figure: Clyne, T.W. Photo: Wang, Y
4 Figure: Clyne, T.W.???
5 Create an efficient method for the measurement of strain patterns of wood particles embedded in a polymer matrix Couple these empirical measurements with material point method (MPM) numerical modeling using inverse problem methodology
6 Tensile tests on polymer specimens with embedded particles Observe strain patterns in the particle-matrix interphase Make the test output compatible with numerical modeling software A. Experiment C. Numerical simulation of the experiment B. Experimental results D. Simulation results Difference (Δ) Figure: Clyne, T.W. Property input Adjust property Sensitivity analysis Stop No Δ Yes Prop.
7 Particles and HDPE mixed HDPE and particles mixed in a blender Molded in a hot press, 1mm thick Wood Particles Specimens punched out of film Reference Particles
8 Cross section of particle embedded in HDPE X-ray Computed Tomography Distance from Surface Embedded Wood Particle
9 Triangulation_16th_century.png
10 A pattern is applied to the surface of the specimen which provides unique patterns for the computer to recognize. Air Air deposition of laser toner 1 mm 1 mm Reference Specimen Wood Specimen
11 3D DIC provides full field, non-contacting optical measurements of displacements and strains Tension Tension Particle-Matrix Interphase Embedded Specimen Embedded Specimen
12 Figure: Clyne, T.W. Reference Particle Analysis Observed Principle Strain Particle Theoretical Observed Shear Strain Particle
13 Reference Particle Analysis Principal Strain Plots Distance from Surface Embedded Particle
14 Reference Particle Analysis Principal Strain Plots and Depth from Surface mm mm mm
15 Reference Particle Analysis Quantitative descriptors Particle length [mm] Particle orientation [degrees from X] Particle distance from the surface [mm] Area of ZOI surface section [mm 2 ] Derivation Measured Measured Measured Measured Equivalent radius of ZOI Circularity of ZOI [r 2 ] Ratio of ZOI equivalent radius to the particle length for 0 and 90 specimens [mm mm -1 ] Ratio of ZOI minor dimension to the particle depth for 45 specimens [mm mm -1 ] Calculated
16 Reference Particle Analysis
17 Reference Particle Analysis
18 Based on Grediac, M. and F. Pierron, 1998 A. Experiment & imaging C. Morph. Modeling Material property input B. Experimental Results ε 1 (DIC) D. ε 1 from model Adjust property Sensitivity analysis Difference (Δ) Stop No Δ Yes Prop.
19 An efficient methodology was created for the preparation, testing, optical measurement, and analysis of single wood particles embedded in a polymer matrix Coupling of optical measurements with MPM modeling and inverse problem methodology provided good qualitative agreement of strain patterns of the particle-matrix interphase A. Experiment & imaging C. Morph. Modeling Difference (Δ)
20 Dr. Lech Muszynski Dr. John Nairn Xiang Lin Farzana Hussain
21 Dr. Lech Muszynski Dr. John Nairn Xiang Lin Farzana Hussain
you need google earth zoom on campus!
Coupling Advanced Imaging Analysis and Morphology Based Modeling for Integrated Characterization of Micromechanics of Wood and Wood-Based Composites Lech Muszyński & John Nairn Department of Wood Science
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