Environmental Effects on Deformation, Strength, and Degradation of - - PowerPoint PPT Presentation

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Environmental Effects on Deformation, Strength, and Degradation of - - PowerPoint PPT Presentation

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University of Puerto Rico University of Puerto Rico Mayagez Campus Mayagez Campus Environmental Effects on Deformation, Strength, and Degradation of Glass Fiber Reinforced Polymers: A Micromechanics-Based Study Pi: Dr. Felipe J.

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Environmental Effects on Deformation, Strength, and Degradation of Glass Fiber Reinforced Polymers: A Micromechanics-Based Study

Pi: Dr. Felipe J. Acosta CoPi’s: Dr. Miguel A. Pando

  • Dr. Luis A. Godoy

Sponsor: US Army Research Office

  • Dr. Larry Russell (POC)

Start: October 1, 2006 Ends: September 30, 2008

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Purpose

To investigate fundamental degradation

mechanisms of FRP composites due to environmental effects (Hygrothermal) at the micromechanical level based on the basic degradation mechanisms involved.

Develop of a predictive tool for long term

behavior for FRP composites

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

The Problem of Hygrothermal Ageing

T2 = 22o C

√Time

T3 = 30o C T1 = 4o C

Moisture Content Moisture Content (or time) Property Value As received Property value

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

The Problem of Hygrothermal Ageing (Cont.)

(a) (b) (c)

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Objectives

Experimentally and analytically identify the

fundamental damage degradation mechanisms of glass FRP composites at the constituent level (i.e. fiber, resin and their interface).

Develop a computational assessment tool based

  • n micromechanics to serve as basis for life

prediction models.

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Tasks to Perform

Develop publication database

– Hygrothermal ageing of polymer composites – Micromechanics of unit cell including interface – Other …

Analytical Model

– Finite Element – Cellular Automata – Diffusion problem

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Tasks to Perform (Cont.)

Base Material Mechanical Characterization

– Tension – Fatigue – Flexural – Impact

Material Characterization as Function of Time

– 50, 100, 200, 300, 400, 500 days

Dynamic Mechanical Analyzer and Microscopy

Analysis

– Chemical and physical changes

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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Schedule

Table 1: Schedule of the Activities Designed for the Proposed Work.

Activity Performance period in Quarters (Proposed start date 9/1/2006) 1 2 3 4 5 6 7 8

  • 1. Literature Review
  • 2. FRP panels purchasing & sample preparation
  • 4. Mechanical testing
  • 5. Analytical model development
  • 6. Analytical model calibration
  • 7. Report & dissemination
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University of Puerto Rico University of Puerto Rico Mayagüez Campus Mayagüez Campus

Team and Preliminary Tasks

  • Dr. Luis Godoy

– Victoria Mondragon: Micromechanical modeling of the hygrothermal ageing development. Model of the fiber/matrix interface in FEM implementing user subroutines in ABAQUS.

  • Dr. Miguel Pando

– Juan Carlos Obando: Gathering publications related to composite materials aging and related publications – Possible Topic: Diffusion of water in epoxy resins

  • Dr. Felipe Acosta

– Irene Mejias and Ruth Roman: Material characterization (Micro and Macro)