On the performance of birch tar made with different techniques

Schmidt, Patrick; Blessing, Matthias A.; Koch, Tabea J.; Nickel, Klaus G.

doi:10.1186/s40494-021-00621-1

Heritage Science

Table 1 Bonded surfaces, shear strengths and maximum shear stresses from the performed lap-shear tests of each of three analysed samples

From: On the performance of birch tar made with different techniques

Tar making method	Surface 1 (mm²)	Surface 2 (mm²)	Average (mm²)	Shear strength τ_(yield) (MPa)	Strain (%)	Maximum shear stress τ_u (MPa)
Condensation	211.65	212.94	212.29	0.55	2.20	0.93
Condensation	304.50	305.51	305.00	1.00	4.40	1.24
Condensation	266.04	316.95	291.49	0.82	3.90	1.32
Condensation (a)	214.16	192.41	203.28	0.90	3.00	1.23
Condensation	278.82	283.89	281.36	1.10	4.20	1.60
Condensation	301.49	275.78	288.63	0.80	3.80	1.14
Condensation	290.81	273.09	281.95	1.10	4.60	1.22
Condensation	275.83	294.56	285.19	1.10	4.40	1.16
Condensation	311.12	290.88	301.00	0.80	3.30	1.31
Condensation	277.51	288.30	282.91	0.78	4.40	0.77
Condensation	322.07	287.43	304.75	0.50	2.60	0.62
Raised structure 20 h	298.66	272.99	285.83	0.90	4.30	0.99
Raised structure 20 h	275.42	299.95	287.69	0.85	3.80	1.08
Raised structure 20 h	304.93	337.93	321.43	0.60	3.30	1.01
Raised structure 20 h	213.96	226.67	220.32	1.10	4.20	1.15
Raised structure 20 h	322.58	322.58	322.58	0.80	3.50	1.28
Raised structure 20 h	303.57	264.90	284.23	0.30	3.60	0.42
Raised structure 20 h (b)	260.21	264.82	262.52	0.82	4.30	0.94
Raised structure 20 h	336.37	334.96	335.66	0.55	2.80	1.10
Raised structure 20 h	331.36	294.26	312.81	0.60	2.40	1.01
Raised structure 20 h	342.52	350.86	346.69	0.48	2.90	0.51
Raised structure 5 h	234.67	254.45	244.56	0.45	2.70	0.21
Raised structure 5 h	332.33	319.04	325.69	0.20	2.80	0.28
Raised structure 5 h	322.58	322.58	322.58	0.18	5.90	0.69
Raised structure 5 h	323.80	246.75	285.27	0.15	1.80	0.22
Raised structure 5 h	310.95	268.32	289.63	0.25	2.40	0.42
Raised structure 5 h	322.58	322.58	322.58	0.60	3.40	0.87
Raised structure 5 h (c)	324.25	295.36	309.80	0.30	2.40	0.45
Raised structure 5 h	330.95	338.62	334.79	0.30	2.60	0.37
Raised structure 5 h	318.88	315.45	317.16	0.20	1.60	0.35
Raised structure 5 h	286.64	299.29	292.97	0.20	2.30	0.31
Raised structure 5 h stone receptacle	322.58	322.58	322.58	0.07	1.60	0.09
Raised structure 5 h stone receptacle	322.58	322.58	322.58	0.12	2.03	0.14
Raised structure 5 h stone receptacle	322.58	322.58	322.58	0.34	1.94	0.37
Raised structure 5 h stone receptacle	322.58	322.58	322.58	0.12	3.47	0.13
Raised structure 5 h stone receptacle	322.58	322.58	322.58	0.33	2.33	0.48

Letters in brackets in the first column are the numbers of stress/strain diagrams shown in Fig. 2

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