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Determination of material properties for short fiber reinforced ceramic matrix composite under bending load

Shi, Yuan and Koch, Dietmar (2017) Determination of material properties for short fiber reinforced ceramic matrix composite under bending load. The 12th Pacific Rim Conference on Ceramic and Glass Technology, 21.-26. Mai 2017, Hawaii, USA. (Unpublished)

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Abstract

For continuous fiber reinforced ceramic matrix composites (CMC), there is an extensive knowledge of the influence of coupon geometry on the failure mode and the determined resistance in bending tests. In contrast, there are few studies on this topic for short fiber reinforced CMC and no geometry standard for bending tests for such materials exists. In this work, the influence of different sample numbers, coupon geometry and test conditions on the calculated mean and variance of flexural strength has been investigated. Two different short fiber CMCs were examined under four point bending mode. It is shown that a number of five coupons is sufficient for getting reliable data. Furthermore it is shown that below a certain specimen cross-section a decrease of the determined strength was observed. The standard deviation and the distribution of rupture stress strongly depended on the specimen geometry size, the fiber length and the loading span width. The correlation of the fiber orientation in the loaded area, of the region of failure initiation and of the measured flexural strength were investigated by high resolution X-ray computer tomography and SEM in order to obtain further insight into the causes of strength scatter in these materials. The presented results will be proposed to a future standard for the bending test of short fiber reinforced CMC materials.

Item URL in elib:https://elib.dlr.de/116113/
Document Type:Conference or Workshop Item (Speech)
Title:Determination of material properties for short fiber reinforced ceramic matrix composite under bending load
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Shi, Yuanyuan.shi (at) dlr.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Date:May 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:material properties, short fiber, ceramic matrix Composite, bending load
Event Title:The 12th Pacific Rim Conference on Ceramic and Glass Technology
Event Location:Hawaii, USA
Event Type:international Conference
Event Dates:21.-26. Mai 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Shi, Yuan
Deposited On:11 Dec 2017 12:15
Last Modified:11 Dec 2017 12:15

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