Issue 15

For (Ø mm sch It n onl sys wa Th BL 4m we def Du BL Hz A p E X set T the board fi 5 mm) which ), clamping ematic repre Fig Figur eeds to be c y be applied tem. Robustn s accepted th e test param DT was abo m with a me re chosen. Th lection of -1m e to machine DT (280 Hz) . icture of the PERIMENT he BLD statistics used. Th -up another f xation a thre have a dist the board at sentation of t ure 4 : The res consecutive e 5 : A schema onsidered tha in one direc ess and repr at in contrast eters were d ut 5 mm and an deflection e maximum m was defin limits, it wa . To remain final test set AL METHOD T was perfo . For the BL ree boards f ive test repet e-point bend ance of 90 m half length. he fixation is (a) ults of the JE high-speed cam the impact. I tic representati t the board i tion. A set-u oducibility o to the actual erived from the maximu of 3mm (BL fibre strains ed to ensure s not possib at the desired -up is shown COMPARIS rmed with ni CBT, as ind or all design itions were p P. F. Fuchs et ing fixture w m to each ot The clampin shown i n Fi SD22-B111 bo era pictures n b) the accor on of the thre s not clampe p with clamp f the test wou BLDT altern the BLDT m fibre stra CBT Set-Up were 1.7 x 1 that no lift-o le to perform optimum m i n Fig. 6. Th ON ne samples o icated in Boa s and both se lanned to app alii, Frattura ed as constructe her. The load g force was a g. 5. ard level drop show the deve ding amplitud e-point bendin d at the posit s at the sup ld have been ating loads c analysis. The in was about 1) and 3mm 0 -3 and 2.2 x ff of the boa the tests at achine displa e event detec f every PCB rd level cyclic t-ups were t ly statistics a Integrità Struttu d, where the is applied b pplied over test high-spee lopment of th e oscilloagram g fixture used ion of the su port rollers w affected, co ould not be maximum 2 x 10 -3 . Fo with a mean 10 -3 , that is rd from the the oscillati cement cont tor was used build-up to bend test develo ested to deci ccording to 0 0 -3 -2 -1 0 1 2 3 amplitude s, mm rale, 15 (2011) board is plac y a fin, whic spring plung (b) d camera anal e PCB deflecti is presented. in the board l pport rollers ould have r unteracting p applied. peak-to-peak r the BLCBT deflection o in the range support rolle on frequency rol precision in the same w obtain repre pment chapte de which per the BLDT ev .01 0.02 time 64-73; DOI: 10 ed centred o h consists of ers to have a ysis. In a) cho on right after evel cyclic ben , implicating esulted in an revious effo oscillation a peak-to-pe f 2.5mm (B of the BLDT rs could occu of the impa the frequenc ay as for th sentative resu r, two differ forms better aluation. 0.03 0.0 t, s .3221/IGF-ESIS. n support ro two rollers ( defined load sen d test. that the load overconstrai rts. Therefor mplitude in ak amplitude LCBT Set-U . The minim r in the tests cted PCB in y was kept a e BLDT. lts and to ap ent set-ups w . For the cho 4 0.05 15.07 67 llers Ø 5 . A can ned e, it the s of p 2) um . the t 25 ply ere sen