where ε0 denotes the unconstrained shrinkage of the fibres. Length
f
measurements on seven dry fibre roving sections before and after sintering yielded, on average, an unconstrained fibre shrinkage of ε0 ≈ 0.5% after sintering for 1h at 1300◦C. This result compares
f
well with data published by the fibre manufacturer, who reports an unconstrained fibre shrinkage of approximately 0.8% after 15 h at 1300◦C [37].