Comparison of percentage of wood fracture surface analyzed by computer and by ISO 6238 in determining the quality of adhesive bonds

U radu su prikazani rezultati mjerenja i procjene udjela lomne površine po drvu pri ispitivanju kvalitete lijepljenja dvjema metodama. Prva se metoda bazira na odredbama ISO 6238 norme, prema kojima su procjenu obavljala dva procjenitelja kako bi se pokazala razlika u percepciji. Drugom metodom udio lomne površine po drvu izmjeren je uz pomoć analize digitalne fotografije putem računala. Rezultati pokazuju da mjerenje udjela lomne površine po drvu uz pomoć analize digitalne fotografije ne pokazuje statistički značajnu razliku od normiranog postupka, ali mjerenja putem računala daju pouzdanije i preciznije rezultate.This paper presents the results of measuring and estimating the percentage of wood fracture surface in testing the quality of adhesive bonds by using two methods. The first method is based on ISO 6238. The estimation was carried out by two estimators so as to show the difference in perception. The second method consists of measuring the percentage of wood fracture surface by analyzing digital photography by computer software. The results prove that there is no statistically significant difference between the measurement of the percentage of fracture surface by analyzing digital photography with computer software and the measurement made by standard process. Computer measurement is, however, more reliable and accurate