In the classical approaches, used in Central Europe in practice, cutting forces and cutting power in sawing processes of timber are commonly computed by means of the specific cutting resistance k c . It needs to be highlighted that accessible sources in handbooks and the scientific literature do not provide any data about wood provenance, nor about cutting conditions, in which cutting resistance has been empirically determined. In the analyses of sawing processes, the use of a model with elements of fracture mechanics involved is an alternative way. In this work, predictions of the newly developed model (FRAC_MOD) for the circular sawing machine are presented. Thanks to this modern approach, it was possible to reveal the usefulness of the FRAC_MOD, using experimental results data on fracture toughness and shear yield stresses of both Polish pine ( Pinus sylvestris L.) and Czech beech wood ( Fagus sylvatica L.). The achieved results were compared to the forecasted values obtained with classical models (CLAS_PL and CLAS_CZ), which are commonly applied in Central European sawmills. The carried out analyses allowed us to discover undesired effects in the form of underestimation of cutting power when applying the CLAS_PL and CLAS_CZ models. For that reason, the FRAC_MOD cutting model could be suggested for the prediction of energetic effects in cases of dynamical analyses and even unsteady cases.

中文翻译：

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重新审视在圆锯机上锯软硬木材时使用不同能量方法对切割功率的估计：中欧案例

在中欧实践中使用的经典方法中，木材锯切过程中的切削力和切削力通常通过比切削阻力 kc 来计算。需要强调的是，手册和科学文献中的可访问资源没有提供任何关于木材来源的数据，也没有提供关于切割条件的任何数据，其中切割阻力是凭经验确定的。在锯切过程的分析中，使用包含断裂力学元素的模型是另一种方法。在这项工作中，提出了对圆锯机新开发模型 (FRAC_MOD) 的预测。由于这种现代方法，有可能揭示 FRAC_MOD 的有用性，使用波兰松 (Pinus sylvestris L.) 和捷克山毛榉木材 (Fagus sylvatica L.) 的断裂韧性和剪切屈服应力的实验结果数据。将取得的结果与中欧锯木厂常用的经典模型（CLAS_PL 和 CLAS_CZ）获得的预测值进行比较。所进行的分析使我们能够在应用 CLAS_PL 和 CLAS_CZ 模型时发现以低估切割功率的形式出现的不良影响。出于这个原因，FRAC_MOD 切割模型可用于在动力学分析甚至非定常情况下预测能量效应。常用于中欧锯木厂。所进行的分析使我们能够在应用 CLAS_PL 和 CLAS_CZ 模型时发现以低估切割功率的形式出现的不良影响。出于这个原因，FRAC_MOD 切割模型可用于在动力学分析甚至非定常情况下预测能量效应。常用于中欧锯木厂。所进行的分析使我们能够在应用 CLAS_PL 和 CLAS_CZ 模型时发现以低估切割功率的形式出现的不良影响。出于这个原因，FRAC_MOD 切割模型可用于在动力学分析甚至非定常情况下预测能量效应。