Kako nastajajo plezališča

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Opis:
Kako trdni so vijaki v plezališču. Vedno sem se spraševal to, medtem ko padam po zraku in me lovi ... lepljenka??? Ugotovili smo, da je vse pritrdjeno v superstrukturo kovinske konstrukcije za steno plezališča. Potem je bilo zabavno vzeti 11-slojno brezovo lepljenko in jo lomno testirati. Strižno je pretrgala pri 26 kN ali 5800 lbf, v natezi pa pri 12 kN ali 2700 lbf. Morda ni tako trdna, če je nanjo ciklično naloženih 6 kN ali celo udarni udar, a to smo dobili v enem počasem testu. Hvala Clintu in Garyju (@clintrycolwell in @garymattos), da sta nam pokazala za steno.