In　this　work　a　series　of　carbon　allotropes　related　to　graphene,　called　graphyne,　graphdiyne,　gaphene-3,　graphene-4　and　graphene-5　are　constructed　by　connecting　two　adjacent　hexagonal　rings　with　different　number　of　acetylenic　linkages.　Mechanical　properties　of　these　monolayer　networks　are　investigated　through　acting　tensile　loads　on　the　architectures　and　molecular　dynamics　simulations　are　performed　to　calculate　the　fracture　strains　and　associated　ultimate　stresses.　In　the　armchair　loading　case,　the　fracture　strain　remains　nearly　unchanged　whereas　the　ultimate　strength　degrades　gradually　with　longer　acetylenic　chains.　In　the　zigzag　loading　situation,　the　ultimate　strength　remains　nearly　the　same　whereas　the　fracture　strain　improves　by　a　little　amount　with　longer　acetylenic　chains.　Furthermore,　Young＇s　moduli　of　all　the　investigated　architectures　are　computed　to　analyze　the　material　stiffness　at　the　near　equilibrium　regime.　The　obtained　results　show　that　these　structures　are　mechanically　stable　with　high　strength　and　stiffness.　The　unique　mechanical　property　variations　of　graphyne　family　against　armchair　and　zigzag　loads　suggest　flexible　designations　towards　functional　use　of　this　novel　material,　especially　in　the　direction-dependent　nanomechanical　applications.　(C)　2012　Elsevier　B.V.　All　rights　reserved.