1 Introduction
2 Experimental methods
2.1 Derivation of the experimental program
2.2 Tsai–Wu failure surface
2.3 Material
2.4 Moisture pretreatment
2.5 2D testing
2.6 Nakajima test
3 Results
3.1 2D tests
Climate | Direction i | \(E_{i}\) (MPa) | \(\nu_{ij}\) (–) | |
---|---|---|---|---|
N | 1 | 12,300 (42%) | \(\nu_{12}\) | 0.4165 (34%) |
2 | 900 (29%) | \(\nu_{21}\) | 0.0305 | |
W | 1 | 6700 (38%) | \(\nu_{12}\) | – |
2 | 200 (17%) | \(\nu_{21}\) | – |
Climate | Direction i | \(\sigma_{i,max}\) (MPa) | \(\varepsilon_{i,max}\) (%) |
---|---|---|---|
N | 1 | 122 (49%) | 1.05 (26%) |
2 | 11 (6%) | 1.84 (53%) | |
W | 1 | 65 (67%) | 1.01 (44%) |
2 | 8 (6%) | 7.45 (5%) |
Climate | Direction ij | \(G_{ij}\) (MPa) | \(\tau_{i,max}\) (MPa) | \(\gamma_{i,max}\) (%) |
---|---|---|---|---|
N | 12 | 900 (9%) | 24 (12%) | 7 (21%) |
W | 12 | 270 (12%) | > 10 (10%) | > 12 |
3.2 Failure surface
3.3 Nakajima test
Climate | Parameter | Units | S245 | S125 | S70 | S30 |
---|---|---|---|---|---|---|
R | z | (mm) | 7.40 (3%) | 7.09 (4%) | 7.45 (4%) | 7.78 (2%) |
\(\varphi_{1, global}\) | (–) | 0.011 (9%) | 0.010 (11%) | 0.011 (11%) | 0.013 (6%) | |
\(\varphi_{1, local}\) | (–) | 0.085 (39%) | 0.070 (22%) | 0.074 (33%) | 0.076 (19%) | |
W | z | (mm) | 16.25 (12%) | 17.05 (11%) | 18.62 (12%) | 17.84 (6%) |
\(\varphi_{1, global}\) | (–) | 0.043 (16%) | 0.051 (21%) | 0.056 (15%) | 0.060 (20%) | |
\(\varphi_{1, local}\) | (–) | 0.174 (44%) | 0.226 (23%) | 0.227 (19%) | 0.242 (9%) | |
W + H | z | (mm) | 14.00 (12%) | 14.84 (3%) | 16.07 (3%) | 18.75 (6%) |
\(\varphi_{1, global}\) | (–) | 0.045 (29%) | 0.056 (8%) | 0.060 (4%) | 0.063 (16%) | |
\(\varphi_{1, local}\) | (–) | 0.207 (39%) | 0.240 (13%) | 0.253 (8%) | 0.308 (20%) |