Two-layer multi-strand cords having very low, low and medium moduli

A two-layer multi-strand cord comprising:

• an internal layer of the cord made up of J>1 internal strands wound in a helix, each internal strand having two layers and comprising an internal layer made up of Q>1 internal threads of diameter D1, and an external layer made up of N>1 external threads of diameter D2 wound around the internal layer;
• and
• an external layer of the cord made up of L>1 external strands wound around the internal layer of the cord, each external strand having three layers and comprising an internal layer made up of Q′≥1 internal threads of diameter D1′, an intermediate layer made up of P′>1 intermediate threads of diameter D2′ wound around the internal layer, and an external layer made up of N′>1 external threads of diameter D3′ wound around the intermediate layer,
• wherein the cord satisfies the following relationship:
• 95≤MC≤175
• where MC=(J×MI+L×ME)/(J+L)
• where MI=200×cos4(α)×[Q×(D1/2)2×cos4(β)+N×(D2/2)2×cos4(γ)]/[Q×(D1/2)2+N×(D2/2)2],
• where D1 and D2 are expressed in mm, α is the helix angle of each internal strand in the internal layer of the cord, β is the helix angle of each internal thread in the internal layer within each internal strand, and γ is the helix angle of each external thread in the external layer within each internal strand,
• where ME=200×cos4(α′)×[Q′×(D1′/2)2×cos4(β′)+P′×(D2′/2)2×cos4(δ′)+N′×(D3′/2)2×cos4(γ′)]/[Q′×(D1′/2)2+P′×(D2/2)2+N′×(D3′/2)2], and
• where D1′, D2′ and D3′ are expressed in mm, α′ is the helix angle of each external strand in the external layer of the cord, β′ is the helix angle of each internal thread in the internal layer within each external strand, δ′ is the helix angle of each intermediate thread in the intermediate layer within each external strand, and γ′ is the helix angle of each external thread in the external layer within each external strand.