For an impact fracture test, the influence of Coulomb friction between the specimen and anvil on contact forces and dynamic stress intensity factor (DSIF) has been investigated numerically. It has been shown that friction leads to increasing of the mean tup and anvil forces and decreasing of mean DSIF. Additionally, in most cases, friction leads to increasing of the amplitude of DSIF oscillations and, in consequence, makes interpretation of the test results more complex. Simple formulae for correction of reduced by friction mean DSIF values have been proposed.

The article presents a reflection on the loss of historical and cultural heritage caused by the pursuit of energy efficiency reduction of buildings. The paper will present the post-war construction development in the Ostrava region, especially the completion of the railway network with the implementation of new railway stations. It is these stations, whose architecture refers to the success of the Czechoslovak Expo 58 pavilion in Brussels, that have faced increased interest in the last few years from conservators seeking to preserve these cultural assets for future generations. The author illustrates this with the example of the inappropriate reconstruction of the railway station in Havířov. The scientific method used is mainly the communication of the author’s own activist experience in saving the railway station from demolition and his own observations during the recent reconstruction of this object. The response to the activities of the Důl architektury association was very topical at the time and led to the production of a documentary by Czech Television titled Requiem for the Station (Hollander, 2015) from the series My Private War.