Fiber fracture during the consolidation of metal matrix composites

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90034-5· OSTI ID:7174403

Groves, J F; Elzey, D M; Wadley, H N.G. ^[1]

---

1. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

A detailed study of conditions leading to fiber fracture during the consolidation of Ti-14wt%Al-21wt%Nb/SiC (SCS-6) composite monotapes has been conducted. For this continuous fiber reinforced composite system, the incidence of fracture increases with consolidation rate at higher process temperatures. Increasing consolidation temperature at a fixed pressure reduces the number of breaks per unit length of fiber. Examination of partially densified compacts has revealed the existence of significant fiber bending and ultimately fracture due to monotape surface roughness (asperities) which places the fibers in three point bending. A representative volume element has been defined for the consolidating lay-up and its response analyzed to predict the fiber deflection (and hence probability of failure) when the surface asperities deform either by plasticity or by steady state creep. The relationships between fiber fracture and process conditions predicted using the volume element are similar to those observed experimentally. The cell analysis suggests that fiber fracture is decreased by increases in fiber stiffness, strength, and diameter and by decreases in matrix yield and creep strength and monotape surface roughness.

• OSTI ID: 7174403
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:6; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPACTING
COMPOSITE MATERIALS
FAILURES
FIBERS
FRACTURES
MATERIALS
NIOBIUM ALLOYS
SILICON CARBIDES
SILICON COMPOUNDS
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS
TITANIUM BASE ALLOYS