Structural Formwork Plywood Mechanical Properties & Grade F17 Structural Plywood Product Evaluation

Transcription

1 COMMERCIAL IN CONFIDENCE Structural Formwork Plywood Mechanical Properties & Grade F17 Structural Plywood Product Evaluation Author: Mr Peter Brown Checked and Authorised: Prof Keith Crews on behalf of accessuts Pty Ltd for Besgrade Products Sdn Bhd 6 th September 2011 Project No: Report ID: BES-MP accessuts Pty Limited PO Box 123 Broadway NSW 2007 Australia Tel Fax ABN accessuts is a controlled entity of the University of Technology, Sydney

2 TABLE OF CONTENTS 1. INTRODUCTION AIM: PROCEDURE: SUMMARY OF STRUCTURAL PROPERTIES Target Properties for Formply Test Results for Formply Bending Parallel to Grain Test Results for Formply Bending Perpendicular to Grain MOISTURE CONTENT CONCLUSIONS & CERTIFICATION OF PROPERTIES SUMMARY OF ANALYSIS Parallel Grain Bending Perpendicular to Grain Bending... 9 DETAILED Results & data Structural Formwork Plywood Mechanical Properties and Grade 2

3 1. INTRODUCTION This report presents the results of mechanical testing for designation of grade properties, undertaken in accordance with AS / NZS The testing was requested by Mr Woei Shyong PEK, Executive Director from Besgrade Products Sdn Bhd and the tests were conducted in the Structural Testing Laboratory of the University of Technology, Sydney (Broadway Campus) as Job number: BES. The tests were carried out by suitably trained technical officers of the Faculty of Engineering and Information Technology, UTS prior to being analysed / reported by Mr Peter Brown and then checked / authorised by Prof Keith Crews. 2. AIM: To determine the relevant mechanical properties of the 18mm Formply, manufactured by Besgrade Products Sdn Bhd, which was supplied to UTS. This report only gives the performance of the particular sheets supplied, due to no quality control certification obtained by the client at the time of testing, as well as no product identification or traceability to production lines. Structural Formwork Plywood Mechanical Properties and Grade 3

4 3. PROCEDURE: UTS has fabricated the test specimens in accordance with AS / NZS , from 30 sheets of Plywood that were picked and supplied by Besgrade Products Sdn Bhd. All specimens have been tested for the following properties in accordance with AS / NZS , and analysed in accordance with AS / NZS 4063 and AS / NZS As required by AS 6669, the formwork plywood has been tested for: 1. bending parallel to grain 2. bending perpendicular to grain 3. moisture content Structural Formwork Plywood Mechanical Properties and Grade 4

5 4. SUMMARY OF STRUCTURAL PROPERTIES 4.1 TARGET PROPERTIES FOR FORMPLY Grade MoE F MPa f b 45 MPa 4.2 TEST RESULTS FOR FORMPLY BENDING PARALLEL TO GRAIN E k, mean R 0.05 R k R k,norm MPa MPa 61.6 MPa 69.4 MPa 4.3 TEST RESULTS FOR FORMPLY BENDING PERPENDICULAR TO GRAIN E k, mean R 0.05 R k R k,norm MPa MPa 54.6 MPa 62 MPa Structural Formwork Plywood Mechanical Properties and Grade 5

6 5. MOISTURE CONTENT The results of 30 randomly selected samples of plywood for determination of oven dried moisture content in accordance with AS / NZS , confirm an average m.c.of 7.4%. 6. CONCLUSIONS & CERTIFICATION OF PROPERTIES When tested in accordance with AS / NZS , and analysed in accordance with AS / NZS 4063 and AS/NZS , the mechanical properties of the subject plywood product meet the performance requirements (defined in AS ) for: Formply - F17 for strength and F17 for stiffness. Authorised Signatory: Dr Keith Crews BE(hons) ME PhD AIWSc MIABSE MIEAust FIAgrE CPEng NPER-3 Professor of Structural Engineering Structural Formwork Plywood Mechanical Properties and Grade 6

7 7. SUMMARY OF ANALYSIS Structural Formwork Plywood Mechanical Properties and Grade 7

8 7.1 PARALLEL GRAIN BENDING Method 1 Method 2 Method 3 Method 4 lognormal distribution to the total data set (2P) Weibull distribution to a lower tail data set. non parametric distribution for a data set ASTM D non-parametric Sample size 30 f (0.05) MPa value f (0.05) MPa f (0.05) MPa f 05[75] MPa mean ln[f (mean) ] 4.64 MPa rank f (mean) MPa rank value 1 stdev 0.28 MPa 15%tile stdev MPa note: Vr 28.6% MAX 15.0 Vr 18.7% Vr 31.0% Max no. of data points = 800 Ω 05[75] 0.93 slope (a) Ω 05[75] 0.91 Ω 05[75] 0.90 note: use Ctrl "A" to clear data char. strength f 05[75] MPa intercept (b) char. strength f 05[75] MPa char. strength f 05[75] MPa sampling factor k s 0.94 sampling factor k s 0.91 method 1 sampling factor k s n/a char. strength f k MPa char. strength f k MPa char. strength f k MPa char. strength f k. #VALUE! MPa Rk(norm) 69.4 MPa method 2 sampling factor k s 0.92 char. strength f k MPa no of value f'x values percentile - p(i) percentile - p(i) percentile - p(i) Sample Size Order Statistic B p i = (i -0.5)/n ln( f'x) p i = (i -0.5)/n X i = ln(-ln(1-p i )) Y i = ln(f i) p i = (i -0.5)/n (f'x - mean)^2 size 28 value for 15th Reproduced from ASTM D B The rank of the data in ascending order Method 1 Sample size 30 E (0.05) MPa mean MPa E (0.50) MPa mean ln (samples) 9.75 MPa note: stdev 0.24 MPa Max no. of data points = 800 Vr 24.0% sampling factor k s 0.97 note: use Ctrl "A" to clear data method 1 mean E k MPa method 2 mean E k MPa percentile - p(i) no of value MoE values p i = (i -0.5)/n ln( E) Structural Formwork Plywood Mechanical Properties and Grade 8

9 7.2 PERPENDICULAR TO GRAIN BENDING Method 1 Method 2 Method 3 Method 4 lognormal distribution to the total data set (2P) Weibull distribution to a lower tail data set. non parametric distribution for a data set ASTM D non-parametric Sample size 30 f (0.05) MPa value f (0.05) MPa f (0.05) MPa f 05[75] MPa mean ln[f (mean) ] 4.49 MPa rank f (mean) 92.4 MPa rank value 1 stdev 0.27 MPa 15%tile stdev MPa note: Vr 27.0% MAX 15.0 Vr 12.6% Vr 26.4% Max no. of data points = 800 Ω 05[75] 0.94 slope (a) Ω 05[75] 0.94 Ω 05[75] 0.92 note: use Ctrl "A" to clear data char. strength f 05[75] MPa intercept (b) char. strength f 05[75] MPa char. strength f 05[75] MPa sampling factor k s 0.95 sampling factor k s 0.94 method 1 sampling factor k s n/a char. strength f k MPa char. strength f k MPa char. strength f k MPa char. strength f k. #VALUE! MPa Rk(norm) 62.0 MPa method 2 sampling factor k s 0.93 char. strength f k MPa percentile - p(i) percentile - p(i) percentile - p(i) Sample Size Order Statistic B no of value f'x values p i = (i -0.5)/n ln( f'x) p i = (i -0.5)/n X i = ln(-ln(1-p i )) Y i = ln(f i) p i = (i -0.5)/n (f'x - mean)^2 size 28 value for 15th Reproduced from ASTM D B The rank of the data in ascending order Method 1 Sample size 30 E (0.05) MPa mean MPa E (0.50) MPa mean ln (samples) 9.78 MPa note: stdev 0.21 MPa Max no. of data points = 800 Vr 21.7% sampling factor k s 0.97 note: use Ctrl "A" to clear data method 1 mean E k MPa method 2 mean E k MPa percentile - p(i) no of value MoE values p i = (i -0.5)/n ln( E) Structural Formwork Plywood Mechanical Properties and Grade 9

10 DETAILED RESULTS & DATA Calculate Properties Current Date: 02-Sep-11 Software version: 1-2; July DATA ENTRY: Properties Parallel to Grain year: Specimen Stiffness Strength Last 30 AS/NZS 4063 CALCULATIONS: - for last 30 test specimens test series: ave width: 20% 20% 40% 40% P max P/ MOE MOR specimens Stiffness target MOE Strength target MOR specimen: date: time: sample no: mm mm kn mm kn kn N/mm MPa MPa ranked COV Ek, mean R0.05 COV Rk Rk, norm INSTRUCTIONS: ) enter the first 30 test results in columns 2 to 10 (yellow to left) ) press the "Calculate Properties" button (above) The relevant properties are displayed below ) enter each subsequent set of results for each test specimen and press the "Calculate Properties" button after each data set is entered This will then calculate properties based on the last 30 test specimens The current data set is always the lowest line of numbers % OK % OK Parallel Structural Formwork Plywood Mechanical Properties and Grade 10

11 Calculate Properties Current Date: 02-Sep-11 Software version: 1-2; July DATA ENTRY: Properties Perpendicular to Grain year: 0 Specimen Stiffness Strength Last 30 AS/NZS 4063 CALCULATIONS: - for last 30 test specimens test series: ave width: 20% 20% 40% 40% P max P/ MOE MOR specimens Stiffness target MOE Strength target MOR specimen: date: time: sample no: mm mm kn mm kn kn N/mm MPa MPa ranked COV Ek, mean R0.05 COV Rk Rk, norm INSTRUCTIONS: ) enter the first 30 test results in columns 2 to 10 (yellow to left) ) press the "Calculate Properties" button (above) The relevant properties are displayed below ) enter each subsequent set of results for each test specimen and press the "Calculate Properties" button after each data set is entered This will then calculate properties based on the last 30 test specimens The current data set is always the lowest line of numbers % OK % OK Perpendicular Structural Formwork Plywood Mechanical Properties and Grade 11