Creep Behaviour and Testing of One-Component Polyurethanes and EPI Adhesives
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1 International Conference on Wood Adhesives October 9-11, Toronto, Canada Creep Behaviour and Testing of One-Component Polyurethanes and EPI Adhesives duration of load test rig with larch glulam beams at MPA Stuttgart, Germany Simon Aicher Zachary Christian Maximilian Henning Gordian Stapf 1
2 Introduction 100 years of creep Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 2
3 Motivation oak wood beam ceiling in Fontainebleau, France Creep between erection and renovation wood creeps Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 3
4 Motivation duration of load test rig with larch glulam beam at MPA Stuttgart, Germany and it does usually not get better when you glue it. Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 4
5 Motivation European Creep Tests for PUR and EPI European and German certification of PUR and EPI adhesives involve bending creep tests. - Creep tests take 6 to 12 months - Reduction of testing time to 3 months would save time and money Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 5
6 Creep test according to EN Dimensions in milimetres A: Measuring gauge for the measuring of the deflection of the specimen Figure 1 according to EN Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 6
7 Creep test according to EN matched pairs of bending specimens 1 = tested adhesive 1 2 = tested adhesive 2 Figure 1 according to EN Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 7
8 Creep test according to EN Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 8
9 Cantilever system to apply dead loads Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 9
10 Relative creep parameter kdef k def t = deflection at time=t deflection at time=0 1 Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 10
11 Relative creep parameter kdef k def t = deflection at time=t deflection at time=0 1 1 minute after load application Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 11
12 Relative creep parameter kdef k def t = deflection at time=t deflection at time=0 1 once every week when changing climate Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 12
13 Excursion: visible shear deformation in the glue line k def t = deflection at time=t deflection at time=0 1 Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 13
14 Excursion: visible shear deformation in the glue line k def t = deflection at time=t deflection at time=0 1 Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 14
15 Creep test according to EN k def t = deflection at time=t deflection at time= Mean value k def mean value k def (EPI) mean value k def (PRF) Test duration t in days Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 15
16 Creep test according to EN C 85% r.h. 40 C 45% r.h. mean value k def (EPI) mean value k def (PRF) Climate step No. Temperature C Relative humidity % 1 (20 ± 2) (85 ± 5) (45 ± 2) (40 ± 5) 168 Duration of climate step h Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 16
17 Creep test according to EN C 85% r.h. 40 C 45% r.h. mean value k def (PUR) mean value k def (PRF) Climate step No. Temperature C Relative humidity % 1 (20 ± 2) (85 ± 5) (45 ± 2) (40 ± 5) 168 Duration of climate step h Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 17
18 k, def(epi)/k,def(prf) Relative Abb.3: Verhältnis Creep: der Durchbiegung RC; Current der EPI-Proben, situation bezogen auf die in PRF-Proben EU (Fugendicke 0,3 mm) 1,50 1,45 1,40 1,35 1,30 1,25 1,20 Rc mean,actual (26 weeks) = 1.16 Rc mean,nominal (52 weeks) 1.15 according to EN ,15 1,10 1,05 Rc mean,nominal (26 weeks) 1.12 according to EN Rc mean,actual (52 weeks) = , Test duration in days Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 18
19 k, def(epi)/k,def(prf) Relative Creep: RC; Main goal of this paper Abb.3: Verhältnis der Durchbiegung der EPI-Proben, bezogen auf die PRF-Proben (Fugendicke 0,3 mm) 1,50 1,45 1,40 1,35 1,30 1,25 1,20 1,15 1,10 1,05 1,00 Rc mean,nominal (13 weeks) 1.12?? Test duration in days Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 19
20 Performed Tests 13 Weeks 26 Weeks 52 Weeks Adhesive Type Adhesive Type Adhesive Type Adhesive Layer Thickness PUR EPI / PEP PUR EPI / PEP PUR EPI / PEP [mm] [n] [n] [n] [n] [n] [n] a 2 a 2 a a One group of specimens compared to MUF instead of PRF Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 20
21 k def for all available results Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 21
22 k def averages for all configurations Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 22
23 R ci for all test results Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 23
24 R ci for all test results Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 24
25 Average Rci for same PUR adhesive with varying bondline thicknesses Average kdef,pur/kdef,prf Average RCi for same PUR adhesive with varying bondline thicknesses 1,24 1,22 1,2 1,18 1,16 1,14 1,12 1,1 RCi,PUR,13 Weeks RCi,PUR,26 Weeks 1,08 1,06 1,04 1, mm Bondline 1 0.3mm Bondline 2 0.5mm 3Bondline Sample Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 25
26 Average R Ci for PUR Adhesives with Bondline Thicknesses of 0.3 and 0.5 mm 0.5 mm 0.3 mm 1.12 Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 26
27 Average R Ci for PUR Adhesives with Bondline Thicknesses of 0.3 and 0.5 mm 0.5 mm 0.3 mm Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 27
28 Average R Ci for EPI and PEP, with Bondline Thicknesses of 0.1, 0.3 and 0.5 mm 0.1 mm 0.3 mm 0.5 mm Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 28
29 Summary oak wood beam ceiling in Fontainebleau, France Thank you very much for your attention! Aicher et al. Creep Behaviour of 1K PU and EPI Adhesives. Int. Conf. on Wood Adhesives 2013, Toronto, Canada 29
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