Distribution-Aware Estimation of A-/B-Basis Characteristic Values for Natural-Fiber Composite Laminates from Single-Source Tensile Data
- 1School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
- 2Department of Mechanical Engineering, College of Engineering, King Faisal University, Al-Ahsa 31982, Saudi Arabia
- 3Institute of Materials Technology, Yeungnam University, Gyeongsan 38541, Republic of Korea
Abstract
Natural-fiber composites exhibit large property scatter, and multi-batch qualification data are rarely available. Using 590 tensile specimens from ten flax, jute, and carbon-fiber laminate groups in a single experimental program, we applied established one-sided lower tolerance limits as approximations of A-basis (99% coverage, 95% confidence) and B-basis (90%, 95%) values for strength, modulus, and failure strain, and compared normal-theory, bootstrap, family-specific pivotal, and selection-robust routes. A Monte Carlo study (eight scenarios, 5000 replicates) showed that the pivotal limit reached a mean A-basis confidence of 0.949 when the family was known but only 0.896 (minimum 0.805) when the family was selected by AIC; an envelope over all three families reached at least 0.944 at the cost of lower limits. An empirical bootstrap cannot exceed a confidence of 1–0.99n (0.311 at n = 37). Two jute-twill records with a zero video-strain reading at peak load were excluded from the strain analysis by a rule based solely on the measurement record, raising the A-basis failure strain by 45%. Retention rankings partly changed when the sample size was equalized. In the five groups that contain a second file-name series, tensile strength differed significantly between the series (Welch p ≤ 0.008), so the pooled limits for these groups assume identically distributed specimens. The values are screening approximations and not design allowables.
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BibTeX
@article{tiwari2026distributionaware,
title = {{Distribution-Aware Estimation of A-/B-Basis Characteristic Values for Natural-Fiber Composite Laminates from Single-Source Tensile Data}},
author = {Saurabh Tiwari and Jongwon Lee and Mohammad Faseeulla Khan and Nokeun Park},
journal = {Polymers},
year = {2026},
month = nov,
doi = {10.3390/polym18212713},
url = {https://www.mdpi.com/2073-4360/18/21/2713},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Distribution-Aware Estimation of A-/B-Basis Characteristic Values for Natural-Fiber Composite Laminates from Single-Source Tensile Data
AU - Saurabh Tiwari
AU - Jongwon Lee
AU - Mohammad Faseeulla Khan
AU - Nokeun Park
PY - 2026
DA - 2026/11/02
JO - Polymers
DO - 10.3390/polym18212713
UR - https://www.mdpi.com/2073-4360/18/21/2713
AB - Natural-fiber composites exhibit large property scatter, and multi-batch qualification data are rarely available. Using 590 tensile specimens from ten flax, jute, and carbon-fiber laminate groups in a single experimental program, we applied established one-sided lower tolerance limits as approximations of A-basis (99% coverage, 95% confidence) and B-basis (90%, 95%) values for strength, modulus, and failure strain, and compared normal-theory, bootstrap, family-specific pivotal, and selection-robust routes. A Monte Carlo study (eight scenarios, 5000 replicates) showed that the pivotal limit reached a mean A-basis confidence of 0.949 when the family was known but only 0.896 (minimum 0.805) when the family was selected by AIC; an envelope over all three families reached at least 0.944 at the cost of lower limits. An empirical bootstrap cannot exceed a confidence of 1–0.99n (0.311 at n = 37). Two jute-twill records with a zero video-strain reading at peak load were excluded from the strain analysis by a rule based solely on the measurement record, raising the A-basis failure strain by 45%. Retention rankings partly changed when the sample size was equalized. In the five groups that contain a second file-name series, tensile strength differed significantly between the series (Welch p ≤ 0.008), so the pooled limits for these groups assume identically distributed specimens. The values are screening approximations and not design allowables.
SN - 2073-4360
ER -