【正文】 ibly too conservative for EUROFER 97 and new design rules should be considered. The suggestion requires however a further indepth study including a verification of all (elastic and elasticplastic) design rules preventing both the Mtype and Ctype damage, a consideration of the irradiation, the hydrogen effect and corrosion effect by the coolant as well as the possible change of the actual TBM geometry. ACKNOWLEDGMENT We are grateful for the experimental data at the room temperature kindly given by . M. Weick. We would also thank Mrs. G. Rizzy for her help in performing the FE simulations. The presented work has been partly supported by the European Fusion Development Agreement (EFDA). REFERENCES [1] J. Aktaa, R. Schmitt, scientific report FZKA 6931, Forschungszentrum Karlsruhe GmbH, 2020 [2] M. Weick, private munication, Forschungszentrum Karlsruhe GmbH, 2020 [3] ABAQUS/Standard User39。 所需的最高值為 1（ 1）和（ 2）在標簽收集的評價。阿所獲得的結果進行比較允許承認，冷卻液壓力部分彌補了等離子加熱的影響。 7聯(lián)同演示南區(qū)區(qū)議會的 SMT 值。 OF DESIGN RULES The aim is now to pare the results discussed above with a prediction of some design rules based on linearelastic simulations. To apply the design rules, Smt, the minimum of Sm and St should be evaluated. Thereby, Sm is the lowest stress intensity at a given temperature among the timeindependent strength quantities and St is a temperature and timedependent stress intensity limit, see . ASME code design rules [3]. A. Calculation ofS m The available Sm and Smt values do not consider a change of the tensile strength and yield stress cycle by cycle. This change can be however taken into account if Sm is calculated on the basis of the experimental data reported by J. Aktaa and R. Schnitt in [1]. Thereby, the maximum achieved tensile stress must be used here for calculations instead of the ultimate tensile strength. To obtain the needed tensile strengths, tensile tests should be performed after . 10, 20 etc. Cycles. The newcalculated in such manner value is represented in fig. 7 together with the Smt values from the DEMO SDC. It was assumed that each cycle is 1930 sec = 0,54 h long. To avoid a misunderstanding, the value has been labelled as S*m. Note that any stress leads to a plastic collapse already after 200 cycles at 650 (923K). As follows from the diagrams in fig. 7, the DEMO SDC provides too high values of Sm/Smt. For instance, values proposed for 650 (923K) are valid for 550 (823K). On the other hand, the calculated values of S*m can also be enhanced if the ultimate strength will be determined correctly. B. Stress Categorization To separate primary and secondary stresses, linearelastic simulations have been performed for three load cases: thermal and mechanical loads acting together and separated. A parison of the results obtained allows to recognize that the coolant pressure partially pensates the influence of the plasma heating. Results of these simulations have been then linearized automatically along the four paths discussed above using the corresponding option of the ABAQUS VIEWER. Note that the ABAQUS VIEWER rotates axes during the automatic linearization procedure. For instance, the x axis is directed along the path chosen. C. Application ofDesign Rules Now, the following design rules (elastic route) can be checked: * rules for prevention of an immediate plastic collapse and a plastic instability (Mtype damage) P S. Pm +Pb KSm * the rule for prevention of a progressive deformation or a ratcheting (Ctype damage) Pm+ Pb+ Q 3 S,m Thereby, K is the bending shape factor, which ranges in general between and . Here, K = . The more conservative rule accounting for a possible embrittlement caused by irradiation is not considered here since the material tested is unirradiated. Besides this factor, the following conventional notations are used