Numerical investigation of insulation glass units with undercut point fittings

The stress peak at the borehole of point-fitted IGU with undercut anchors

“…The tests were conducted until failure of the connection and the maximal bearing force was recorded for each test sample. The data have been statistically evaluated and the characteristic connection resistance and a corresponding partial safety factor have been derived (Tibolt, Hechler, & Odenbreit, 2013). The mean values of the connection resistance are compared to the mean values of the test campaign at the 'IKI' (Beyer, 2007) (Table 2).…”

“…Thus, both distributions could be assumed to determine the characteristic values (5%fractile value). However, to exclude meaningless negative values for the resistance, the log-normal distribution has been retained for the statistically evaluation (Tibolt, Hechler, & Odenbreit, 2013). An alternative to the log-normal distribution is the Weibull distribution.…”

“…Though, the influence of production and refining on the glass strength is known (Beyer, 2007). The influence is not included in the partial safety factors derived in this paper and therefore they are only valid for samples tested with the set-up described in section 5.2 (Tibolt, Hechler, & Odenbreit, 2013).…”

“…The values for each test series were averaged to exclude measurement errors. The positions of the strain gauges for the tension, shear and diagonal pull tests were determined by preliminary FE calculation (Tibolt, Hechler, & Odenbreit, 2013).…”

“…The verification and calibration process of the numerical model of the Fischer FZP-G-Z consists of four steps (Tibolt, Hechler, & Odenbreit, 2013): The element type and the mesh quality of the glass pane were checked by calculation of the stress concentration factor k (Section 3.4) and comparison to the values given in Z-70.2-122 (2007). A glass plate with the detailed undercut borehole was modelled and subjected to pure bending (Fig.…”