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MMS5 Design and Failure of Materials Systems under Multiaxial Loads

MMS5 A AEAT/NPL Project
www.mms5.co.uk Email info@mms5.co.uk

The following links are provided as a convenience to users of the MMS5IAG Noticeboard.

The MMS5A project is managed for DTI by AEA Technology, Engineering Solutions in partnership with NPL and NetComposites. Contact info@mms5.co.uk for more information

The ARP Consortium are working on the complementary MMS5B Project, details of which can be found at www.arpconsortium.org/mms5.asp

MMS5 A About the AEAT/NPL MMS5 Project

This project, which is being undertaken by a team consisting of AEA Technology, NPL and NetComposites, has the objective of establishing a technical framework that will address the types of question typically posed by engineers concerned with the design of composite structures subjected to multi-axial loads. The key data will be presented in the form of an Interactive Knowledge Base (IKB).

Specific issues that will be addressed are:

what failure criteria are relevant for particular applications;
what evidence or data are available to validate the choice of criteria
how do the criteria relate to long term performance
what test methods are available to measure multi-axial performance
how can available criteria be applied to materials of different structure
what minimum amount of testing is necessary in order to define performance envelopes?

Example Output from an Interactive Knowledge Base for composite design methods

Introduction
PROJECT SUMMARY
Objectives
Extending the Database
Interactive knowledge Base
Industrial Seminars and industrial advisory group
Exploitation
Keywords
Contact
Participate in MMS5.....

Introduction

The performance of materials under the action of multi-axial loads is of key importance for the designers of engineering structures. This is especially the case for composites where the effect of anisotropy can result in a structure that is 'unforgiving' towards loads that have not been properly addressed. Whilst there are many published design methods and failure theories for composites, it remains the case that no single approach has broad application either in terms of material or structural form. This project, which is being undertaken by a team consisting of AEA Technology, NPL and NetComposites, has the objective of establishing a technical framework that will address the types of question typically posed by engineers concerned with the design of composite structures subjected to multi-axial loads. The key data will be presented in the form of an Interactive Knowledge Base (IKB). Specific issues that will be addressed are:

what failure criteria are relevant for particular applications;
what evidence or data are available to validate the choice of criteria
how do the criteria relate to long term performance
what test methods are available to measure multi-axial performance
how can available criteria be applied to materials of different structure
what minimum amount of testing is necessary in order to define performance envelopes?

The project team will work closely with the complimentary project being led by QinetiQ.

MMS5 PROJECT SUMMARY

Title

Design and Failure of Materials Systems under Multi-axial Loads

Objectives

To provide designers with a robust approach to the selection of the appropriate failure criteria for their application.
To extend the database of multi-axial test data to alternative material forms.
To provide an Interactive Knowledge Base (IKB) concerned with the design of composite structures under multi-axial loading.

Extending the Database

A philosophy behind the project will be to maximise the benefit that can be gained from existing published information and to focus further experimental work on those material systems where there is a more limited amount of data. A consequence of this is that testing will relate primarily to the woven and mat material that dominate composites’ usage in industry.

This test work will be carried out in conjunction with a modelling activity; the intent being to use the analysis to assist in the understanding of the experimental results, thereby allowing the data to be extrapolated to other similar systems with confidence.

Interactive knowledge Base

The IKB concept provides a framework that permits the presentation of project output in an easily assimilated and relevant way. It is differentiated from the more staid ‘expert’ system approach in that the use of modern interactive IT methods allows the system to impart knowledge as opposed to the simple listing of information. In this project the results will be presented within an IKB structure and formatted to include: a browse facility by design method; a recommend facility that would identify and rank the most appropriate methods for a particular application; a keyword search facility that would recall background information relevant to the design method or application; a knowledge base of relevant reports and publications, case studies; and access through to other related sites.

Industrial Seminars and industrial advisory group

Industrial seminars will be held during the project. The subject of the seminars will include dissemination of the project output and demonstration of the IKB.

A smaller group, the industrial advisory group (IAG), will meet twice a year and will also receive regular updates of the findings of the project, including access to a closed website. The IAG will be shared with the complementary QinetiQ project.

The IAG will influence the direction of the work and members will have direct access to all the outputs from the project, many of which are exclusive to IAG members.

MMS5 Design and Failure of Materials Systems under Multiaxial Loads

MMS5 A AEAT/NPL Project www.mms5.co.uk Email info@mms5.co.uk

Other Links

MMS5 A About the AEAT/NPL MMS5 Project

MMS5 PROJECT SUMMARY

MMS5 A AEAT/NPL Project
www.mms5.co.uk Email info@mms5.co.uk