In　recent　decades,　various　bar-typed　miniature　energy　dissipaters　with　buckling　restrained　mechanisms　have　been　proposed　for　seismic　mitigation　of　engineering　structures.　The　recently　proposed　assembled　steel　rod　energy　dissipater　(ASRED),　incorporating　equally　divided　tubes　as　filler　components,　have　shown　plump　hysteretic　loops　and　remarkable　fatigue　performance.　For　such　miniature　dissipaters　with　varied　dimensions,　its　ultra-low-cycle　fatigue　(ULCF)　life　is　correlated　with　the　geometrical　dimensions.　However,　no　research　concerning　this　issue　has　been　found.　To　enable　the　fracture　prediction　of　ASREDs　under　various　loading　situations,　numerical　models　integrated　with　the　ductile　fracture　model　were　established　in　this　paper.　A　newly　proposed　constitutive　model　and　the　famous　combined　hardening　model　were　both　employed　in　the　numerical　models　to　comparatively　investigate　the　key　factors　affecting　the　accuracy　of　the　fracture　prediction.　Moreover,　the　possible　influence　of　Lode　angle　was　also　investigated　by　employing　two　different　ductile　fracture　models,　namely,　the　cyclic　Bai-Wierzbicki　model　(CBWM)　and　the　cyclic　void　growth　model　(CVGM).　Seven　specimens　with　different　lengths　and　loading　protocols　were　simulated,　and　the　results　show　that　the　strain　amplitude　distributes　unevenly　in　the　ASRED　and　increases　cycle　by　cycle　at　the　fixed　ends,　which　leads　to　the　necking-induced　failure　mode.　Using　the　fracture　model　of　CBWM,　numerical　simulations　that　considers　the　influence　of　strain　amplitude　could　successfully　predict　the　fracture　of　all　specimens.　The　dissipaters　behaved　approximately　in　an　axially　loaded　state　throughout　the　entire　fatigue　life,　therefore　the　influence　of　the　Lode　angle　was　negligible,　and　the　fracture　predictions　given　by　the　CVGM　are　same　with　that　by　the　CBWM.　Based　on　a　comprehensive　analysis　of　the　extended　numerical　investigations,　an　improved　configuration　for　ASRED　is　proposed.　©　2023　Elsevier　Ltd